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3D printed lowers


3D Printed AR15 Lower (5 Best)

3D printed AR-15 lowers used to be the thing of pipe dreams.

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.

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.

UBAR 2 3D Printable AR15 Lower

UBAR 2 STL Files

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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

U-Bolt Vanguard

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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

Firebolt AR Lower

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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

3D Printed AR-15

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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

AR-9

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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

DOUBLE RIB AR-15

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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

LR-308

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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!

Hoffman Tactical – Home of the Super Lower !

We design firearms that you can print at home. The AR-15 is the primary focus, though we do lots of other things. You can see some of them below.

Current designs include AR-15, AR-9, and LR-308 lower receivers, as well as stocks and grips. All of our designs can be printed on basic printers from PLA+.

To get started head over to the downloads page and grab your files. Pick up a printer and some filament. Read up on guns and 3D printing as much as you can. Check out our information pages. you can even get some parts from us. And remember, always read the README!

You can find Hoffman Tactical on YouTube, Instagram, Twitter, Rumble, and Odysee. To stay up to date, be sure to subscribe to the email list at the bottom of the page!

New stock system is ergonomically correct and has a positive retention method.

Lazy little follow.

Taulman Glass Fiber Nylon Test Samples. Impact and tensile. Other then it's creep issue, I really like this Nylon.

Nice doggie.

AR-9 Prototype with built in support.

A separated 9 MM case. This is the result of a too light buffer in an AR-9.

Creep test with Overture Easy Nylon. Annealing almost completely eliminated the creep problem.

Buffer Bands fresh from the plating shop.

An LR-308 Prototype. I did not like the VO3D PLA that it was printed from.

Double Rib Lower after a range day. Taulman Glass Fiber Nylon.

Overture Easy Nylon waiting to be creep tested.

PLA test samples used to evaluate the new impact tester.

Test piece for testing different design parameters.

An attempt at more accurate printer calibration.

COEX Nylon. I have actually had a lot of clogging issue with the carbon fiber. I think it has too high of a fiber content.

TPU butt pad prototype for Gen 3 Stocks.

Playing with tree support. I still think built in support is much better, and will design some for a Glock frame sooner then later.

COEX CF Nylon. You can see the results of a nozzle clog on the right.

Printing a TPU butt pad for a Gen 2 Stock.

Old style Gen 1 AR-15 swivel pin plates.

Grip Prototype. I have found that an inverted honeycomb is a better texture then plain honeycomb.

3D printed AR-15 Upper and Lower prototype.

Chilling in the snow with the Double Rib Super Lower.

I bought this nozzle to use with fiber filled Nylon. The larger 0.5 MM orifice should help prevent clogging, but still provide good detail.

5.56 x 45 spent casings after a day at the range.

Triggers waiting to be packed into kits.

Nozzle Temp vs. Layer adhesion eSun PLA+

AR-9 Heavy Buffer. These are a must for a good AR-9 build.

My Ender 3. It's a capable little machine that comes at a ridiculously low cost.

A collection of 3D printed AR lowers. LR-308, Double Rib, AR-15, and AR-9.

A bushing comes to life.

Brass Bushings for the Reinforcement Kits.

V2.5 LR-308 Lower. This is a great lower, the V3.0 grip is nice as well.

Assembled V2.5 LR-308 Super Lower waiting for it's upper to be built up. KAK bolt and Aero Precision upper and handguard.

Annealing small glass filled Nylon parts in an oil bath.

Number Crunching Gizmo.

V1.4 LR-308 Super Lower with the Gen one stock and grip.

Broken 80% lower.

Cool guy sent me these.

Ghost Guns.

3D Printed AR-15 and LR-308 lowers with the Gen 1 Stocks.

Square nut insert shortly before being imbedded in the print.

V3 Chairmanwon G17 frame. Pretty cool.

Lots of broken samples. Tensile and impact testing.

Fun under white phosphor.

This is an awesome lower. Push Plastic Carbon Fiber Nylon.

New buffer band prototype.

Cleaning the Prusa V6 Hot End.

Hell Fire Lower.

AR-9 Super Lower with a KAK bolt and barrel.

308 Ammo with the V1. 4 LR-308 Lower in the background.

The first functional AR-15 Lower printed by Hoffman Tactical.

LR-308 First Print Ever.

I've had a lot of issues printing with the Push Plastic Carbon Fiber Nylon recently, but it makes for great prints when it works.

An interesting experiment. AR-15 Super Lower printed on a resin printer from eSun Hard Tough resin.

The first lower printed with a buffer band.

Gen Two Stock installed on an LR-308 Lower V1.4.

SpongeBob Squarepants 3D File | Patrick Star Pants

CHRISTMAS ORNAMENT - Elven thing

2,99 €

Christmas decoration - Santa Claus

2.99 €

Pepechu - Pepe Pikachu Funny Meme Pokemon Figurine

2.99 €

Iron Fist Alexander (Elden's ring) - planter | jar

10 €

Christmas decoration - Santa Claus

2. 99 €

3D MULTICOLOR LOGO/SIGN - Team Fortress 2

0,99 €

3D MULTICOLOR LOGO/SIGN - Dragon Ball Z

2,99 €

3D MULTICOLOR LOGO/SIGN - Batman (2022)

2,99 €

Totoro - desktop organizer | planter (multicolor assembly)

10 €

3D MULTICOLOR LOGO/SIGN - Demon Slayer

0,99 €

3D MULTICOLOR LOGO/SIGN - Looney Tunes

2,99 €

3D MULTICOLOR LOGO/SIGN - Man with chainsaw

2,99 €

Best Files for 3D Printers in the Art Category

Secret design

Text Flip, 2019 - star

Free

Modular photo frame (5 x 7.

6 cm (2 x 3 inches))

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Deactivated

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Parametric table decorations

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Eiriss

6.50 €

The fox and the steampunk engine

2.85 €

Art category bestsellers

Cute elf with flexi print

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Archaeopteryx nibbler

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Flexi Print-in-Place Dinosaur Brachiosaurus

2.80 €

CUTE CROCODILE WITH FLEXIBLE PRINT IN PLACE

2,80 €

Astronaut on flexi printer

2,80 €

Stitch Love (easy printing without support)

1,50 €

Crystal Dragon Articulating Animal Flexi Wiggle Pet Print On The Spot Fantasy

3. 80 €

Articulated bat toy, body with prints, head with latches, cute flexi

3,30 €

Leopard gecko ball joint toy, imprinted body, snap head, cute flex

3,30 €

Cute sloth with flexi print

2,80 €

Biting Dragon

3 €

GHOST ZU - GHOST WITH FEET

2,77 €

Articulated toy "Python Snake", imprint body, snap head, cute flexi

3,75 €

Triceratops on flexi printer

2,80 €

Gingerbread man ornament with flexi print

1.38 €

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