Decentralized manufacturing
Free, open-source 3D-printable firearm designs.
We design weapon systems you can 3D print with low-cost, accessible equipment. The designs are always free, always documented, always available for anyone to use. Kits are a convenience — never a requirement.
Always free
Every design and its documentation is free to download and use.
Fully documented
Detailed printing and assembly docs ship with every release.
Decentralized
Parts can always be sourced elsewhere. No single point of control.
The designs
Released & ready to print
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SL-15
The flagship 3D printed AR-15 lower receiver.
View design -
SL-9
A fully featured AR-9 lower, Glock-magazine compatible.
View design -
SL-308
A 3D printed LR-308 lower receiver.
View design -
ORCA-15
A mostly 3D printed AR-15 platform.
View design -
Super Safety
A 3D printed active-reset safety.
View design -
SL-15-DR
The double-rib AR-15 lower variant.
View design
Build kits
Support the free designs
Buying a kit funds ongoing design development. It's the convenient path — every part can still be sourced on your own.
Learn
New to 3D-printed firearms?
Start here. Our guides cover everything from picking a printer to dialing in slicer settings.
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HOW THE PROCESS WORKS
Manufacturing your own weapons can be a daunting prospect. On this page it will be broken down into the basic steps so that you can understand the skills, information, and resources you need to gai…
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3D Printer Buying Guide
Choosing a 3D printer is simpler than it looks. There a large number of options, and understanding all the different specs can be daunting. This page will break it down to a few popular printers to…
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History
History of Development 2020 02/08/2020 First Inspiration Printing an AR-15 lower receiver was something I wanted to try when I bought my first printer. But trying to find files early 2020 proved to…
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Filament Buying Guide
Short Answer Use Polymaker PLA Pro for testing and your first prints. It will melt at elevated temperatures. Use Bambu PET-CF or PPA-CF for long term prints. A 0.6 nozzle may be required. Siraya Te…
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Slicer Settings Guide
Slicer settings are critical to a strong print. All of our new releases contain detailed information on the settings to use. This page will be an overview of slicer settings, what they are and what…
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Q & A
Here we try to answer the more general questions. Answers are arranged by category. Assembly a Does the AR-9 Ejector need to be glued in? Short answer, no. Long answer, it won’t hurt until you need…