Back to Colorado

HB26-1144 • 2026

Prohibit Three-Dimensional Printing Firearms & Components

The bill defines 3-dimensional printing to mean additive and subtractive manufacturing. The bill prohibits each of the following: Knowingly manufacturing or producing a firearm, unfinished frame or re

Crime Education Elections Firearms Technology
Passed Legislature

This bill passed both chambers and reached final enrollment, even if later executive action is not shown here.

Sponsor
Rep. A. Boesenecker, Rep. L. Gilchrist, Sen. T. Sullivan, Sen. K. Wallace, Rep. J. Bacon, Rep. K. Brown, Rep. S. Camacho, Rep. M. Carter, Rep. C. Espenoza, Rep. M. Froelich, Rep. L. Goldstein, Rep. E. Hamrick, Rep. J. Jackson, Rep. J. Joseph, Rep. M. Lindsay, Rep. J. McCluskie, Rep. K. McCormick, Rep. K. Nguyen, Rep. M. Rutinel, Rep. G. Rydin, Rep. E. Sirota, Rep. L. Smith, Rep. R. Stewart, Rep. J. Willford, Rep. S. Woodrow, Rep. Y. Zokaie, Sen. J. Amabile, Sen. A. Benavidez, Sen. J. Coleman, Sen. L. Cutter, Sen. J. Danielson, Sen. L. Daugherty, Sen. J. Gonzales, Sen. I. Jodeh, Sen. C. Kipp, Sen. C. Kolker, Sen. W. Lindstedt, Sen. M. Weissman
Last action
2026-04-02
Official status
House Considered Senate Amendments - Result was to Concur - Repass
Effective date
Not listed

Plain English Breakdown

The bill summary does not provide details on penalties for possession of digital instructions under certain circumstances, leaving some uncertainty.

Ban on 3D Printing of Firearms

This bill makes it illegal to use 3D printing or CNC milling machines to make firearms, firearm parts, and digital instructions for making them, with some exceptions.

What This Bill Does

  • Defines 3-dimensional printing as both adding material layer by layer (additive manufacturing) and removing material from a block of material (subtractive manufacturing).
  • Makes it illegal to knowingly use 3D printing or CNC milling machines to make firearms, unfinished frames or receivers, large-capacity magazines, or rapid-fire devices.
  • Does not allow federally licensed firearm manufacturers, gunsmithing program instructors and students, or institutions that run such programs to be punished for making these items if they are used only for educational purposes.
  • Makes it illegal to possess digital instructions meant to make firearms or parts using 3D printing or CNC milling machines in a way that shows intent to manufacture or distribute them illegally.
  • Prohibits distributing digital instructions for making firearms or firearm components with 3D printers or CNC milling machines, unless the distribution is part of an accredited gunsmithing program's educational activities.

Who It Names or Affects

  • People who use 3D printing or CNC milling machines to make firearms or parts.
  • Individuals and institutions involved in making digital instructions for firearm production using these technologies.
  • Federally licensed firearm manufacturers, instructors, students of accredited gunsmithing programs, and institutions that run such programs are exempt from certain prohibitions.

Terms To Know

3-dimensional printing
A process where objects are built layer by layer using a printer or similar device (additive manufacturing) or material is removed to create an object (subtractive manufacturing).
CNC milling machine
A computer-controlled machine that cuts and shapes materials to make parts.

Limits and Unknowns

  • The bill only applies to potentially functional firearms and firearm components, not non-functional or prop items.
  • It does not specify penalties for possession of digital instructions in circumstances indicating intent to distribute to federally licensed manufacturers.

Amendments

These notes stay tied to the official amendment files and metadata from the legislature.

H.001

Committee of the Whole

Lost

Plain English: The amendment changes a part of HB26-1144 by adding a new section that says if any part of the bill is found to be invalid, then the whole bill cannot stand and will not be enforceable.

  • Adds a 'Nonseverability' clause to the bill which means if one part of the bill is declared invalid, the entire bill becomes invalid.
  • The amendment text does not provide details on why this nonseverability clause was added or what specific parts of the original bill might be affected.
  • It's unclear how this change will impact the overall intent and enforcement of HB26-1144.
H.003

Committee of the Whole

Lost

Plain English: The amendment adds a requirement for the Colorado Bureau of Investigation to study whether three-dimensionally printed firearms are responsible for a measurable percentage of gun crimes in Colorado by December 31, 2026.

  • Adds a new section requiring the Colorado Bureau of Investigation to conduct a study on the involvement of 3D-printed firearms in gun crimes.
  • Specifies that certain sections of the bill will only take effect if the study determines that 3D-printed firearms are statistically responsible for a measurable percentage of gun crimes.
  • The exact details and findings of the study are not specified, so it's unclear what specific information will be gathered.
  • It is not clear how the determination made by the Bureau will affect the implementation of other parts of the bill.
H.004

Committee of the Whole

Lost

Plain English: The amendment changes the penalties for violating the bill from a Class 1 misdemeanor to a Class 2 misdemeanor and from a Class 5 felony to a Class 6 felony.

  • Changes the penalty for manufacturing or producing a firearm, unfinished frame, or receiver that violates the bill from a Class 1 misdemeanor to a Class 2 misdemeanor.
  • Changes the penalty for knowingly manufacturing or producing such items from a Class 5 felony to a Class 6 felony.
  • The amendment does not provide details on what constitutes a violation of the original bill, only changing the penalties associated with it.
H.005

Committee of the Whole

Lost

Plain English: The amendment changes the status of HB26-1144 from a bill under consideration to one that has been rejected.

  • Reverses the previous decision made by the Committee of the Whole regarding HB26-1144, marking it as lost.
  • The amendment does not provide details about why or how the bill was marked as lost, nor does it explain any further actions that might be taken after this change in status.
L.001

HOU Judiciary

Passed [*]

Plain English: The amendment adds the word 'knowingly' to certain parts of the bill, making it clear that actions like manufacturing or possessing firearms must be done with awareness and intent.

  • Adds 'knowingly' before 'manufacture' on page 2, line 8.
  • Adds 'knowingly' before 'possess' on page 3, line 5.
  • Adds 'knowingly' before 'offer' on page 3, line 22.
  • The amendment does not provide further details about what constitutes 'knowingly'.
L.003

Second Reading

Passed [**]

Plain English: The amendment changes the penalties for violating firearm manufacturing restrictions and removes certain references to possession of firearm printing plans.

  • Removes language about possessing firearm or component printing plans from the bill text.
  • Changes criminal penalties for violations to civil infractions instead of classifying them as misdemeanors or felonies.
  • Modifies definitions related to models used in manufacturing firearms.
  • The amendment's text is technical and may require further context to fully understand all implications.
L.004

Second Reading

Passed [**]

Plain English: The amendment adds exceptions for federally licensed firearm manufacturers and accredited gunsmithing programs, allowing them to manufacture firearms or distribute digital instructions for educational purposes.

  • Adds an exception for federally licensed firearm manufacturers from the prohibition on manufacturing firearms.
  • Allows instructors and students of accredited gunsmithing programs to manufacture firearms solely for educational instruction.
  • Permits distribution of digital instructions between instructors and students in accredited gunsmithing programs for educational use.
  • The amendment does not specify the exact conditions or requirements for accreditation of gunsmithing programs, which may be unclear without additional context.
L.005

Second Reading

Lost [**]

Plain English: The amendment adds a new clause to the bill that allows people who make firearms through 3D printing to avoid breaking the law if they get a federal firearms license holder to add a serial number and do a background check within two days.

  • Adds an exception to the prohibition on manufacturing firearms, allowing individuals to avoid legal penalties if they serialize the firearm with a federally licensed firearms dealer within 48 hours of manufacture.
  • The amendment text does not specify what happens if someone fails to comply with the requirements within 48 hours.
  • It is unclear how this amendment will interact with existing federal regulations on firearms manufacturing and sales.
L.006

Second Reading

Lost [**]

Plain English: The amendment adds a requirement for the Colorado Bureau of Investigation to study whether three-dimensionally printed firearms are involved in gun crimes and specifies conditions under which certain parts of the bill would take effect based on the study's findings.

  • Adds a new section requiring the Colorado Bureau of Investigation to conduct a study by December 31, 2026, on whether three-dimensionally printed firearms are responsible for measurable gun crimes in Colorado.
  • Specifies that certain parts of the bill will only take effect if the bureau determines that such firearms are statistically significant in gun crimes.
  • The exact details and timing of when certain sections of the bill would become active depend on future study results, which introduces uncertainty.
L.008

Second Reading

Lost [**]

Plain English: The amendment adds a condition for certain sections of the bill to take effect, requiring federal authorization and notification from the Department of Public Safety.

  • Adds new subsections (5) to section 4, which specify that parts of the bill will only go into effect if allowed by federal law.
  • Requires the executive director of the Department of Public Safety to notify the revisor of statutes via email when a certain condition is met.
  • The exact details and implications of the federal authorization required are not fully explained in the amendment text.
L.009

Second Reading

Lost [**]

Plain English: The amendment proposes to remove specific sections from the original bill related to manufacturing and producing firearms, unfinished frames, or receivers using 3-dimensional printing methods.

  • Removes lines that define and prohibit knowingly manufacturing or producing a firearm, unfinished frame, or receiver through 3-dimensional printing.
  • The amendment text does not provide enough information to fully explain all the changes it intends to make beyond removing specific sections from the bill.
L.011

Second Reading

Lost [**]

Plain English: The amendment removes references to 'similar device' in the bill text related to prohibitions on manufacturing firearms, unfinished frames, or components using 3-dimensional printing.

  • Removes 'MACHINE, OR SIMILAR DEVICE.' from page 2, lines 10 and 11 of the printed bill.
  • Strikes out 'OR SIMILAR DEVICE' from page 4, line 22 of the bill text.
  • Replaces 'MACHINE OR SIMILAR DEVICE.' with just 'MACHINE.' on page 4, lines 24 and 25.
  • The exact impact of removing references to similar devices is not fully explained in the amendment text.
L.012

Second Reading

Lost [**]

Plain English: The amendment adds a new definition for 'similar device' which refers to computer-controlled machines that can produce firearm frames or receivers.

  • Adds a new section (f) defining 'similar device' as a machine functionally equivalent to a 3D printer or CNC milling machine, capable of producing firearm parts.
  • The amendment does not specify how this definition will be used in the bill's existing prohibitions.
  • It is unclear what specific types of machines fall under 'similar device'.
L.013

Second Reading

Lost [**]

Plain English: The amendment adds a new clause to the bill that allows for the manufacture and distribution of digital instructions for making nonfunctional firearms used in theatrical performances, role play, or as artwork.

  • Adds an exception allowing the creation and sharing of digital files for nonworking guns intended for use in theater, role-playing games, or art.
  • The amendment does not specify what qualifies as 'nonfunctioning' or how to determine if a firearm is meant for theatrical purposes, role play, or artwork.
L.015

Second Reading

Lost [**]

Plain English: The amendment adds a requirement for the Division of Criminal Justice to study the effects of the bill and report its findings in January 2028.

  • Adds a new section requiring the Division of Criminal Justice to conduct a study on the impacts of the bill, including data collection about charges and convictions related to violations of this section.
  • Specifies that the division must present information from this study during its 'Smart Act' hearing in January 2028.
  • The amendment also includes a repeal clause which removes the new provisions after June 30, 2028, but does not specify what happens to the study's findings beyond this date.
  • Some technical details about how the study will be conducted are not provided in the amendment text.
L.016

Second Reading

Lost [**]

Plain English: The amendment adds a clause that allows people to use 3D printing for educational, research, journalistic, or manufacturing compliance purposes without breaking the law.

  • Adds an affirmative defense for individuals who manufacture firearms or firearm components using 3D printing for lawful educational, research, journalistic, or manufacturing compliance purposes.
  • The amendment does not specify what qualifies as 'lawful' in these contexts and how it will be enforced.
L.019

Second Reading

Lost [**]

Plain English: The amendment changes the term 'unfinished frame' to 'receiver' in a bill about 3-dimensional printed firearms.

  • Changes the word 'unfinished frame' to 'receiver' in the bill text.
  • The exact implications of this change are not fully explained in the provided amendment text, so more context is needed to understand its full impact.
L.023

Second Reading

Passed [**]

Plain English: The amendment adds a new clause to the bill that limits its application to potentially functional firearms and firearm components, excluding other types of 3D printed items.

  • Adds a new section (4) after line 5 on page 4 of the bill, which specifies that the prohibition applies only to potentially functional firearms and their parts.
  • The amendment text does not specify what constitutes 'non-functioning or prop firearm components,' leaving some ambiguity about exactly which items are excluded from the ban.
L.024

Second Reading

Lost [**]

Plain English: The amendment changes the penalties for manufacturing or producing firearms, unfinished frames, or components using 3-dimensional printing from a Class 5 felony to a Class 6 felony.

  • Changes the penalty for knowingly manufacturing or producing a firearm, unfinished frame, or component using 3-dimensional printing from a Class 5 felony to a Class 6 felony.
  • The amendment only specifies changes to penalties and does not provide details on other aspects of the bill such as definitions or enforcement mechanisms.
L.025

Second Reading

Lost [**]

Plain English: The amendment changes parts of the bill related to prohibitions on manufacturing firearms and firearm components using certain technologies, altering specific sections that deal with legal actions against violators.

  • Removes references to possession of firearm or component printing plans from the bill text.
  • Modifies language regarding violations by specifying it as an activity constituting a violation of section 18-12-111.5.
  • Adds provisions for the Attorney General to bring legal actions against individuals violating this section.
  • The amendment text is complex and technical, making some parts difficult to interpret fully without additional context.
L.027

Second Reading

Lost [**]

Plain English: The amendment adds a condition to the bill, making it illegal for people who are not allowed to have guns under state or federal law to make firearms using 3D printing.

  • Adds language that prohibits individuals barred from possessing firearms by Colorado state law (Section 18-12-108) or federal law from manufacturing firearms through 3-dimensional printing.
  • The amendment text does not specify the exact penalties for violating this new condition.
L.029

Second Reading

Lost [**]

Plain English: The amendment changes the language in the bill to specify that a firearm or its components must be primarily designed and intended to be used as such, rather than just being capable of use.

  • Changes the phrase 'THAT MAY BE USED' to 'PRIMARILY DESIGNED TO BE USED, AND INTENDED BY THE PERSON TO BE USED'.
  • The amendment text is limited and does not provide full context about how this change will affect the bill's overall intent.
L.032

Second Reading

Lost [**]

Plain English: The amendment removes the phrase 'or firearm component' from the bill text, changing what is prohibited under the bill.

  • Removes the prohibition on manufacturing or producing a firearm component.
  • It's unclear how this change affects other parts of the bill that might reference firearm components.
L.033

Second Reading

Lost [**]

Plain English: The amendment changes a part of the bill by adding a new section that says if any part of the law is found to be invalid, then the whole law cannot stand and all parts are considered together.

  • Adds a nonseverability clause which means if one part of the law is declared invalid, the entire law becomes invalid.
  • Removes lines from page 5 that were originally in the bill.
  • The exact content removed on page 5 is not specified and cannot be explained further without additional information.
L.034

Second Reading

Lost [**]

Plain English: The amendment removes the phrase 'potentially functional' from a bill that deals with restrictions on manufacturing firearms using 3D printing technology.

  • Removes the term 'potentially functional' from the existing language in the bill.
  • It is unclear what specific impact removing this phrase will have without additional context about how it was used in the original amendment.
L.036

Second Reading

Lost [**]

Plain English: The amendment changes when a new law about 3D-printed firearms will start and how it can be changed by voters.

  • Changes the effective date of the bill to take effect after a specific period following the end of the legislative session, unless there is a referendum petition against it.
  • Adds that if a referendum petition is filed, the law won't go into effect until approved by voters in November 2026.
  • The exact date when the bill will take effect depends on the end date of the legislative session and whether there are any petitions against it.
  • Details about how the referendum process works are not explained in this amendment text.
L.039

Second Reading

Lost [**]

Plain English: The amendment adds a new section to the bill that says if any part of the law is found to be invalid, then the whole law cannot stand and will not be enforceable.

  • Adds a nonseverability clause to the bill. This means that if one part of the law is declared invalid by a court, the entire law becomes invalid.
  • The amendment does not specify what would happen to existing laws or regulations related to firearms manufacturing if this new act is invalidated.
  • It's unclear how this nonseverability clause will affect future legal challenges to the bill.
L.040

Second Reading

Lost [**]

Plain English: The amendment changes when and how a bill about 3D-printed firearms becomes law.

  • Changes the start date for the new rules to be after August 12, 2026, unless voters disagree with it in November 2026.
  • Makes sure that the rules only apply to actions taken on or after its effective date.
  • The exact start date depends on when the general assembly adjourns and if there is a referendum petition filed against the bill.
L.045

Second Reading

Lost [**]

Plain English: The amendment removes references to firearm components from the bill that aims to prohibit manufacturing firearms using 3-dimensional printing.

  • Removes 'or firearm component' from line 5 on page 2 of the bill.
  • Removes 'OR FIREARM COMPONENT' from line 8 on page 2 of the bill.
  • Replaces 'FIREARM OR FIREARM COMPONENT.' with just 'FIREARM.' in lines 12 and 13 on page 2 of the bill.
  • Removes 'OR FIREARM COMPONENT' from lines 13 and 14 on page 2 of the bill.
  • The amendment does not provide additional details about why firearm components are being removed or what impact this change will have on the original intent of the bill.
L.047

Second Reading

Lost [**]

Plain English: The amendment changes the date from July 1, 2026 to July 1, 2031 for when a certain provision of the bill would take effect.

  • Changes the effective date from July 1, 2026 to July 1, 2031.
  • The amendment text does not provide details about what specific provision is delayed until July 1, 2031.
L.050

Second Reading

Lost [**]

Plain English: The amendment adds an exception to the bill, allowing peace officers and former peace officers who have not been convicted of a felony to be exempt from certain prohibitions related to manufacturing firearms.

  • Adds a new section (b) after line 4 on page 4 of the reengrossed bill, which excludes peace officers and former peace officers without a felony conviction from the firearm manufacturing prohibitions.
  • The exact nature of the prohibitions that this amendment exempts peace officers and former peace officers from is not fully detailed in the provided text.
L.051

Second Reading

Lost [**]

Plain English: The amendment adds an exception to the bill, allowing members of the United States Armed Forces or Colorado National Guard and honorably discharged veterans who have not been convicted of a felony to be exempt from certain firearm manufacturing restrictions.

  • Adds a new section (b) after existing sections that exempts military personnel and honorably discharged veterans without felony convictions from the bill's prohibitions on manufacturing firearms.
  • The exact nature of the original prohibitions is not fully detailed in the provided amendment text, so specifics about what activities are allowed for exempt individuals cannot be explained completely.
L.052

Second Reading

Passed [**]

Plain English: The amendment removes certain sections of the bill that deal with the distribution of firearm or firearm component printing plans and related prohibitions.

  • Removes lines from page 2 that mention the distribution of firearm or firearm component printing plans.
  • Eliminates lines on page 3 that contain specific prohibitions regarding these plans.
  • Strikes out lines on page 4 that include further restrictions on such plans.
  • The amendment text does not provide details about the exact content of the removed sections, so it's unclear what specific prohibitions or requirements were eliminated.
L.053

Second Reading

Lost [**]

Plain English: The amendment adds a clause that allows people to use 3D printing for educational, research, journalistic, or manufacturing compliance purposes without breaking the law.

  • Adds an affirmative defense to charges of violating the bill's restrictions on manufacturing firearms or firearm components using 3-dimensional printing methods.
  • The amendment does not specify what qualifies as 'lawful educational, research, journalistic, or manufacturing compliance purposes.'
L.054

Second Reading

Lost [**]

Plain English: The amendment adds a condition to the bill, stating that it is illegal for people who are not allowed to have firearms under Colorado law or federal law to make or produce firearms using 3D printing.

  • Adds language to prohibit individuals barred from possessing firearms by state (Section 18-12-108) or federal laws from manufacturing or producing firearms through 3D printing.
  • The amendment text does not specify the exact penalties for violating this new condition.
L.055

Second Reading

Lost [**]

Plain English: The amendment adds a new requirement that a graduate of an accredited gunsmithing program can be included in the existing list related to firearm manufacturing.

  • Adds language allowing graduates of accredited gunsmithing programs to be recognized under certain provisions.
  • The provided amendment text is incomplete and does not clearly indicate where or how this new requirement fits into the bill's existing structure, making it hard to fully understand its impact.
L.056

Second Reading

Lost [**]

Plain English: The amendment adds an exception to the bill, allowing people with disabilities to manufacture adaptive components for firearms if it helps them accommodate their disability and does not make a legal firearm illegal.

  • Adds an exception that allows individuals with disabilities to create parts for firearms (adaptive components) solely to help with their disability, as long as these parts do not change the firearm into something illegal under state or federal law.
  • The amendment text does not specify what qualifies as an 'adaptive component' or how it will be regulated. It also doesn't clarify if there are any specific requirements for individuals to prove their disability status before manufacturing such components.

Bill History

  1. 2026-04-02 House

    House Considered Senate Amendments - Result was to Concur - Repass

  2. 2026-03-31 House

    House Considered Senate Amendments - Result was to Laid Over Daily

  3. 2026-03-30 Senate

    Senate Third Reading Reconsidered - No Amendments

  4. 2026-03-30 Senate

    Senate Third Reading Passed - No Amendments

  5. 2026-03-27 Senate

    Senate Second Reading Passed with Amendments - Floor

  6. 2026-03-26 Senate

    Senate Second Reading Laid Over to 03/27/2026 - No Amendments

  7. 2026-03-25 Senate

    Senate Second Reading Laid Over to 03/26/2026 - No Amendments

  8. 2026-03-24 Senate

    Senate Second Reading Laid Over to 03/25/2026 - No Amendments

  9. 2026-03-19 Senate

    Senate Committee on State, Veterans, & Military Affairs Refer Unamended to Senate Committee of the Whole

  10. 2026-03-05 Senate

    Introduced In Senate - Assigned to State, Veterans, & Military Affairs

  11. 2026-03-02 House

    House Third Reading Passed - No Amendments

  12. 2026-02-27 House

    House Second Reading Special Order - Passed with Amendments - Committee, Floor

  13. 2026-02-23 House

    House Second Reading Laid Over Daily - No Amendments

  14. 2026-02-18 House

    House Committee on Judiciary Refer Amended to House Committee of the Whole

  15. 2026-02-04 House

    Introduced In House - Assigned to Judiciary

Official Summary Text

The bill defines 3-dimensional printing to mean additive and subtractive manufacturing. The bill prohibits each of the following:

Knowingly
manufacturing or producing a firearm, unfinished frame or receiver, large-capacity magazine, or rapid-fire device (firearm or firearm component) by 3-dimensional printing. The prohibition does not apply to a federally licensed firearm manufacturer
, an instructor or student of an accredited gunsmithing program, or an institution that operates an accredited gunsmithing program. Unlawful three-dimensional printing of a firearm or firearm component is a class 1 misdemeanor; except that a second or subsequent offense is a class 5 felony.

Possessing, in circumstances that indicate intent to manufacture a firearm or firearm component in violation of state law or intent to distribute, digital instructions that may be used to program a 3-dimensional printer or a computer numerical control (CNC) milling machine to manufacture or produce a firearm or firearm component. The prohibition does not apply to a federally licensed firearm manufacturer who possesses digital instructions in circumstances that indicate intent to manufacture a firearm or firearm component.

Knowingly offering to sell or
distributing digital instructions that may be used
to program a 3-dimensional printer or CNC milling machine to manufacture or produce a firearm or firearm component.

for an activity that constitutes a violation of specified existing state law concerning unlawful conduct involving an unserialized firearm, frame, or receiver. The prohibition does not apply to distribution of digital instructions to or between an instructor and student of an accredited gunsmithing program, or an institution that operates an accredited gunsmithing program, when the distribution is solely for educational instruction. Unlawful distribution of digital firearms production instructions is a civil infraction.

The prohibitions in the bill only apply to potentially functional firearms and firearm components.

The bill does not prohibit possession of digital instructions in circumstances that indicate intent to distribute to, or distributing digital instructions to, a federally licensed firearm manufacturer.

A violation of any of the prohibitions in the bill is a class 1 misdemeanor; except that a second or subsequent offense is a class 5 felony.
(Note: Italicized words indicate new material added to the original summary; dashes through words indicate deletions from the original summary.)
(Note: This summary applies to the reengrossed version of this bill as introduced in the second house.)

Current Bill Text

Read the full stored bill text
Second Regular Session
Seventy-fifth General Assembly
STATE OF COLORADO
REREVISED
This Version Includes All Amendments
Adopted in the Second House
LLS NO. 26-0048.01 Conrad Imel x2313 HOUSE BILL 26-1144
House Committees Senate Committees
Judiciary State, Veterans, & Military Affairs
A BILL FOR AN ACT
CONCERNING MEASURES TO PROHIBIT THE USE OF101
THREE-DIMENSIONAL PRINTING TO MANUFACTURE FIREARMS.102
Bill Summary
(Note: This summary applies to this bill as introduced and does
not reflect any amendments that may be subsequently adopted. If this bill
passes third reading in the house of introduction, a bill summary that
applies to the reengrossed version of this bill will be available at
http://leg.colorado.gov.)
The bill defines 3-dimensional printing to mean additive and
subtractive manufacturing. The bill prohibits each of the following:
! Manufacturing or producing a firearm, unfinished frame or
receiver, large-capacity magazine, or rapid-fire device
(firearm or firearm component) by 3-dimensional printing.
The prohibition does not apply to a federally licensed
SENATE
3rd Reading Unamended
March 30, 2026
SENATE
3rd Reading Unamended
March 30, 2026
SENATE
Amended 2nd Reading
March 27, 2026
HOUSE
3rd Reading Unamended
March 2, 2026
HOUSE
Amended 2nd Reading
February 27, 2026
HOUSE SPONSORSHIP
Gilchrist and Boesenecker, Bacon, Brown, Camacho, Ca rter, Espenoza, Froelich,
Goldstein, Hamrick, Jackson, Joseph, Lindsay, McCormick, Nguyen, Rutinel, Rydin, Sirota,
Smith, Stewart R., Willford, Woodrow, Zokaie
SENATE SPONSORSHIP
Sullivan and Wallace, Amabile, Benavidez, Coleman, Cutter, Danielson, Daugherty,
Gonzales J., Jodeh, Kipp, Kolker, Lindstedt, Weissman
Shading denotes HOUSE amendment. Double underlining denotes SENATE amendment.
Capital letters or bold & italic numbers indicate new material to be added to existing law.
Dashes through the words or numbers indicate deletions from existing law.
firearm manufacturer.
! Possessing, in circumstances that indicate intent to
manufacture a firearm or firearm component in violation of
state law or intent to distribute, digital instructions that may
be used to program a 3-dimensional printer or a computer
numerical control (CNC) milling machine to manufacture
or produce a firearm or firearm component. The prohibition
does not apply to a federally licensed firearm manufacturer
who possesses digital instructions in circumstances that
indicate intent to manufacture a firearm or firearm
component.
! Distributing digital instructions that may be used to
program a 3-dimensional printer or CNC milling machine
to manufacture or produce a firearm or firearm component.
The bill does not prohibit possession of digital instructions in
circumstances that indicate intent to distribute to, or distributing digital
instructions to, a federally licensed firearm manufacturer.
A violation of any of the prohibitions in the bill is a class 1
misdemeanor; except that a second or subsequent offense is a class 5
felony.
Be it enacted by the General Assembly of the State of Colorado:1
SECTION 1. In Colorado Revised Statutes, add 18-12-118 as2
follows:3
18-12-118. Unlawful three-dimensional printing of a firearm4
or firearm component - penalties - definitions.5
(1) (a) A PERSON SHALL NOT KNOWINGLY M ANUFACTURE OR6
PRODUCE A FIREARM OR FIREARM COMPONENT BY MEANS OF7
THREE-DIMENSIONAL PRINTING USING A THREE -DIMENSIONAL PRINTER,8
CNC MILLING MACHINE, OR SIMILAR DEVICE.9
(b) A PERSON WHO VIOLATES THIS SUBSECTION (1) COMMITS10
UNLAWFUL THREE-DIMENSIONAL PRINTING OF A FIREARM OR FIREARM11
COMPONENT. UNLAWFUL THREE-DIMENSIONAL PRINTING OF A FIREARM OR12
FIREARM COMPONENT IS A CLASS 1 MISDEMEANOR ; EXCEPT THAT A13
SECOND OR SUBSEQUENT OFFENSE IS A CLASS 5 FELONY.14
1144-2-
(c) THIS SUBSECTION (1) DOES NOT APPLY TO:1
(I) A FEDERALLY LICENSED FIREARM MANUFACTURER;2
(II) A N INSTRUCTOR OR STUDENT OF AN ACCREDITED3
GUNSMITHING PROGRAM, OR AN INSTITUTION THAT OPERATES AN4
ACCREDITED GUNSMITHING PROGRAM, WHEN THE MANUFACTURE IS5
SOLELY FOR PURPOSES OF EDUCATIONAL INSTRUCTION WITHIN THE6
ACCREDITED GUNSMITHING PROGRAM.7
8
9
(2) THIS SECTION ONLY APPLIES TO POTENTIALLY FUNCTIONAL10
FIREARMS AND FIREARM COMPONENTS AND DOES NOT APPLY TO THE11
THREE-DIMENSIONAL PRINTING OF ANY OTHER COMPONENTS OR12
COMPONENTS THAT COULD BE USED TO MAKE A NON -FUNCTIONING OR13
PROP FIREARM.14
(3) AS USED IN THIS SECTION, UNLESS THE CONTEXT OTHERWISE15
REQUIRES:16
(a) "CNC MILLING MACHINE " MEANS A COMPUTER NUMERICAL17
CONTROL MILLING MACHINE.18
19
(b) " FIREARM COMPONENT " MEANS AN UNFINISHED FRAME OR20
RECEIVER, LARGE-CAPACITY MAGAZINE, OR RAPID-FIRE DEVICE.21
(c) "GUNSMITHING PROGRAM" MEANS A GUNSMITHING PROGRAM22
OPERATED BY AN INSTITUTION.23
(d) "INSTITUTION" MEANS A STATE-AUTHORIZED INSTITUTION OF24
HIGHER EDUCATION OR INSTITUTION REGULATED BY THE COLORADO25
DIVISION OF PRIVATE OCCUPATIONAL SCHOOLS.26
(e) "LARGE-CAPACITY MAGAZINE" HAS THE SAME MEANING SET27
1144-3-
FORTH IN SECTION 18-12-301.1
(f) "THREE-DIMENSIONAL PRINTING" OR "3-D PRINTING" MEANS2
ADDITIVE MANUFACTURING THAT BUILDS THREE-DIMENSIONAL OBJECTS3
BY USE OF A THREE -DIMENSIONAL PRINTER OR SIMILAR DEVICE AND4
SUBTRACTIVE MANUFACTURING THAT CREATES OBJECTS BY REMOVING5
MATERIAL FROM A WORKPIECE BY USE OF A CNC MILLING MACHINE OR6
SIMILAR DEVICE.7
SECTION 2. Severability. If any provision of this act or the8
application of this act to any person or circumstance is held invalid, the9
invalidity does not affect other provisions or applications of the act that10
can be given effect without the invalid provision or application, and to11
this end the provisions of this act are declared to be severable.12
SECTION 3. Effective date - applicability. This act takes effect13
July 1, 2026, and applies to offenses committed on or after said date.14
SECTION 4. Safety clause. The general assembly finds,15
determines, and declares that this act is necessary for the immediate16
preservation of the public peace, health, or safety or for appropriations for17
the support and maintenance of the departments of the state and state18
institutions.19
1144-4-