Best 3D Printed AR15 Lower & Upper (2023 Updated)

3D printed AR-15 lowers used to be the thing of pipe dreams. In 2024 the 3D printed AR is no longer a pipe dream but a firm reality for gun enthusiasts around the world.

However, those dreams have become a reality with the invention of 3D printed AR-15 platforms like the UBAR, U-Bolt Vanguard, Hoffman Tactical, and Firebolt lower frames.

As a handful of very strong 3D AR15 designs have been around for some time, there have also been many remixes that allow for further customizations and aesthetics to the platform.

In the last 2 to 3 years, 3D printed gun design has skyrocketed and opened the floodgates for many excellent gun printing options.

When the first 3D printed AR-15 lower came online, it took the internet by storm and helped to inspire other 3D gun developers to push what was thought possible even further.

In 2022 there is now a wide range of 3D printed AR options, from the customizable to the reinforced, and even meme options like the double-barreled AR-15.

If you are trying to decide which AR-15 lower to print for your needs, continue reading as we deep dive and cover all of the AR lower 3D printing options available today.

Orca 3D Printed AR15

Hoffman Tactical has made headlines in the gun industry with the release of his fully 3D printed AR-15 rifle, “The Orca”.

This innovative firearm is a game-changer and has garnered attention from 3D gun enthusiasts and onlookers alike. The project aimed to print as much of the AR-15 as possible without compromising performance, resulting in a firearm that replaces many factory components with printed or non-firearm parts.

The Orca features a unique attachment system, with the handguard and stock attached to the receivers by tapered clips held in place by hose clamps, providing strength and a low profile while allowing for easy customization.

Biden’s Bane AR15 Upper

The Biden’s Bane AR15 upper receiver is a 3D printable firearm component designed for use with rifle caliber rounds, such as 223, 556, and 762×39.

This upper receiver is a DIY project for gun enthusiasts or those looking to build unserialized ghost guns. One of the standout features of the Biden’s Bane AR15 upper receiver is its use of a DIY gas tube, which helps to disperse heat and prevent the printed upper receiver body from being damaged during use.

It has been well tested and documented by gun enthusiasts and has been found to be a reliable option for a build, particularly for use cases that involve firing between 30 to 60 rounds at a time.

The name of the upper receiver, Biden’s Bane, has sparked controversy and debate among gun enthusiasts, with some seeing it as a statement against the Biden administration’s policies on firearms.

D1913 v2 .22 AR15

The DS1913 is an AR-15 lower that is optimized for an Atchission/CMMG .22 LR conversion kit and is packed with features that will impress even the most discerning shooter.

One of the standout features is the 1913 rail on the rear, allowing for easy mounting of compact braces or stocks, making it a great choice for those who want to customize their AR-15 for maximum comfort and accuracy. The bolt-catch delete provides added reinforcement and improves overall reliability, ensuring your AR-15 is always ready when needed.

The DS1913 also includes quality-of-life updates such as optimized takedown spring geometry and an off-set takedown stand-off, increasing print life and ensuring your AR-15 stays in top condition for years to come.

BUBAR10 .308 AR15

The BUBAR10 is a 3D printable LR308-style lower receiver that has taken the firearms world by storm. It is a modified version of the UBAR, but with the addition of simple hardware store metal parts to reinforce the lower.

These enhancements solve the major design concerns that printed AR lowers face, making the BUBAR-10 a solid option for printable 308 lowers. The U-Bolt to clamp the buffer tower down, two humps to spread bending force at the rear of the receiver, and two eye bolts to act as the front takedown lugs on the lower greatly enhance the strength and durability of the lower, making it able to withstand pushup tests, drops, throws, kicks, and other hard abuse.

If you’re looking for a reliable and high-powered 3D-printed firearm, the BUBAR-10 is definitely worth considering.

FamAR Famas & AR15 Hybrid

Black Lotus Coalition has released the initial files for the Famar, a bullpup style rifle chambered in 5.56 and using readily available AR15 parts.

The Famar is a testament to continued innovation in the 3D printed rifle space and is set to make waves in 2023. Development is ongoing, with more updates and improvements expected in the future.

UBAR 2 3D Printable AR15 Lower

The UBAR 2 is a 3D printable AR15 lower receiver. It is an evolved version of the U-Bolt Vanguard lower – more straightforward to assemble, more robust, and compatible with a wider variety of AR15 parts.

The UBAR is a guaranteed solid choice designed by Ivan the Troll, one of the best 3D printed gun developers to hit the scene.

At the core of the UBAR’s design is its simple reinforcements – using hardware store metal parts solves the major design concerns that printed AR15 lowers face. 

Using a U-Bolt to reinforce the rear tower and rod end eye bolts to reinforce the front takedown lug, the UBAR is a contender for the strongest printable AR15 lower design at its time of publication.

Printed Parts Checklist:

UBAR2 Lower Receiver

Four variants are the UBAR2, and four are the UBAR2C – the “C” designation indicates that the lower has a little extra clearance required for some side charging/billet/nonstandard uppers.

UBAR2 and UBAR2C have four sub-variants: high-shelf options and low-shelf options. Print one of the low-shelf models if you use an FRT trigger or other device requiring a low-shelf receiver. 

Otherwise, the standard lowers will be more robust (since lowering the shelf increases a stress concentration in the lower).

For all the high and low-shelf variants, there are two sub-variants – lowers that have a cutout for the forward assist, and lowers that do not. Print the forward assist version if you have a forward assist installed on your rifle. 

If you have a side charging AR, one without a forward assist, or you removed/plugged your forward assist, you can print the no forward assist version, as it will be slightly stronger.

General Print Settings:

The UBAR 3D printed lower AR receiver has been tested to work well in eSun PLA+. This receiver should also work in any material similar to or superior to PLA+.

Recommended print settings for PLA+ were as follows:

Walls: I used 8, but you can use whatever works best for your setup.

Nozzle: 0.4mm

Layer Height: 0.15mm or 0.16mm

Temp: 230/60C

Infill: 100% Recommended – while the UBAR might not need 100% fill, this ensures that you won’t end up hurting the lower if you overtighten anything.

Supports: On/full (tree supports are ok)

Cooling fan: 20% normal, 50% on bridges. Off for the first 10 layers. Keep the fan speed low to prevent warp.

Bed Adhesion: gluestick or hairspray recommended

All other settings can/should be left as default or whatever you know works best with your printing setup.

U-Bolt Vanguard AR-15

The U-Bolt Vanguard is yet another 3D printed AR-15 lower designed by Ivan the Troll.

The U-Bolt Vanguard is updated and modeled after the original Fosscad V5.1 GS AR design.

This AR lower tested up to 2000 rounds of 5.56 ammunition and showed no signs of structural integrity loss.

This AR frame only works with carbine and pistol buffer tubes.

While the U-Bolt is quite bulky for your typical AR-15 lower, it is reinforced, bulked up, and modeled for maximum compatibility with the Colt M4 TDP, which helps assembly go a little smoother.  

Also, note that the buffer tube threads modeled here are NOT to spec but are instead modeled so that they can be printed and used without tapping.

If you want a choker of an AR-15 that will hold up and sh** on the funds who claim 3D guns will blow your hand off, the U-Bolt Vanguard is a great AR lower printed pick.

Firebolt AR Lower

The Firebolt AR-15 lower is one of the go-to choices for those that want both durability, modularity, and customization.

The Firebolt is printed in several different pieces and then bolted together. Hence the name “Firebolt”.

The Firebolt AR lower is totally 3D printed and compatible with a ton of uppers/calibers, including .223 (AR-15), 9mm (AR-9), and .45 (AR-45).

The “buffer tower” also allows for many options on the Firebolt, including the standard buffer tube reinforced with a “U” bolt and a 100% printed buffer tube.

The Firebolt, its predecessor, the thunderbolt, and the AR-15 waffle magazine were all designed, printed, and tested initially by 3D gun developer SpookySpectre.

If you are looking for reliability, strength, and a bit of customization, the Firebolt AR lower has you covered.

Hoffman Tactical 3D Printed AR-15

Hoffman Tactical launched in mid-2019 focussing on mostly unrelated manufactured parts for various applications.

With the rise of 3D printing in 2020, Hoffman Tactical transitioned into 3D printing, which was soon followed by a focus on AR builds.

Hoffman Tactical, to date, has mainly worked on perfecting the AR-15, AR-9, and LR-308 3D printed lower receivers.

The Hoffman Tactical AR-15 lower is their “flagship” design. The HT AR-15 lower print files contain the Super AR-15 Lower(STL and STEP files), designed to be paired with their reinforcement kit. This 3D print download also includes the Basic AR-15 Lower, which requires some parts and a 2″ hose clamp.

Hoffman Tactical AR-9

The AR-9 lower(AR-15 style lower chambered in 9mm) is based on the Hoffman Tactical V3.0 Super AR-15 Lower. 

The AR-9 utilized Glock-style magazines and a 3D printed mag catch/ejector. The only non-AR-15 part required is the 3/32″ x 1″ roll pin for the mag catch.

Hoffman Tactical DOUBLE RIB AR-15

The Hoffman Tactical Double Rib AR-15 Super Lower is named for its two ribs(stronger than one) and has an open right side for ambidextrous AR enthusiasts. 

The Double Rib AR-15 will not work with upper AR receivers that include a forward assist. A hose claim is also needed for this 3D printed AR-15 frame, but a bit larger at 28″. Slick sides and side chargers only.

Hoffman Tactical LR-308

If you prefer to shoot bullets in 308 or 6.5 Creedmoor, the Hoffman Tactical LR-308 is the gun for you.

This 3D printed frame accepts LR-308 / DPMS Gen 1 / SR-25 upper. It is currently in version 2.6 and has stood up to a large amount of durability testing.

Double Barrel AR

The Double Barrel 3D printed AR may be in the running for meme gun of the year(although competition is high…looking at you, Ivan the Troll).

This print runs 2 3D printed AR-15 lowers and uppers in tandem with a connector making this the ultimate in-home defense.

Need mo’ firepower? The Double Barrel AR may be for you!

Conclusion

We hope you have learned something and gotten a bit closer to finally cranking up that Ender 3 and printing your own AR-15 lower at home.

Innovation is constant, and new 3D printed STL files are hitting the internet daily.

If you have a favorite AR-15 lower design or think we missed one of the great 3D prints, please drop a comment below.

Happy AR-15 building, blasting, and, most of all, meeting!