3D print model · STEP + STL
A 72 cm replica of the Half-Life 2 Gravity Gun, designed for the first Maker Faire Prague. 52 unique parts, full STEP sources and an illustrated assembly guide. Everything but one part prints without supports.
Two looks, one model
Five parts carry the light: the inner and outer shell, both case light covers and the arm lights. Print them in transparent orange for the gun as you first find it, or in light-blue PLA for the supercharged version. Everything else is grey PLA; PETG works too.
Anatomy
Six sub-assemblies held together with standard M3 and M6 hardware. The claw is a real four-bar linkage, the same one that moved on servos in 2018.
Origin · 2018
I modelled the Gravity Gun in 2018 as the centrepiece of my photo booth at the very first Maker Faire Prague. I picked it because it isn’t a typical game weapon but an anti-gravity device, and a good excuse to learn Arduino, servo motors and LED strips.
The original lit up, moved its arms and made sounds. I left the sparks switched off. For this release I closed the holes for switches and connectors, replaced the servos with printed dummies and left out a few of the original parts. The electronics aren’t ready to publish yet; the components and circuit diagrams may follow.
“Not a typical weapon from a computer game, but an anti-gravity device.”
It lit up, moved its arms and made sounds.
Primed, sanded, painted and weathered by hand.
Gallery
Watch
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Print guide
STL files come oriented for printing. Grey PLA for the body, transparent orange or light blue for the five light parts. Only the side grip case gauge needs supports.
Discs, repro case, case, body, three arms and the side grip case, joined with M3 and M6 screws and nuts. The illustrated PDF walks through every screw.
The gun in the photos was primed, sanded, painted and weathered. Or leave it straight off the printer.
STEP files keep every part in its original position, handy for fitting your own LEDs, servos and a speaker into your build.
Assembly guide · preview
The illustrated guide that comes with the files walks through all six sub-assemblies, screw by screw. Here is the first one.
Screw the grip oval to the grip cap, the cap to the main grip, then the main grip to disc right.
Press two M6 nuts into disc right (a dab of hot glue holds them), then bolt disc left to it.
Attach the disc right cover with its ribbed drum.
Press two more M6 nuts into disc left. The case rear bolts onto these later.
Attach the disc left cover. The discs are done; on to the repro case.
Everything that isn’t printed: standard metric screws and nuts from any hardware store. Button head means ISO 7380, socket head cap means ISO 4762. Counts are rounded up, so expect a few left over.
98screws12nuts
| Part | Size | Qty | Used in |
|---|---|---|---|
| Button head screw | M3 × 6 | 2 | Discs |
| Socket head cap screw | M3 × 10 | 3 | Repro case |
| Socket head cap screw | M3 × 12 | 38 | Case, body, ribs |
| Button head screw | M3 × 18 | 11 | Discs |
| Socket head cap screw | M3 × 20 | 20 | Discs, case, arms |
| Socket head cap screw | M3 × 30 | 12 | Body |
| Socket head cap screw | M3 × 40 | 6 | Discs, body |
| Socket head cap screw | M6 × 30 | 3 | Case |
| Socket head cap screw | M6 × 60 | 3 | Case |
| Hex nut | M3 | 8 | Case |
| Hex nut | M6 | 4 | Discs |
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$9$29
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FAQ
Not out of the box. The original from 2018 had an Arduino, servos, LED strips and sound, but the published parts are the printable shell: switch and connector holes are closed and the servos are printed dummies. The STEP files make it easy to add your own.
About 72 × 42 × 27 cm assembled. Every part fits the bed of an Original Prusa MK2.
Everything was printed on an Original Prusa MK2, so an MK3, MK4 or any printer with a similar bed will do. Grey PLA for the body and transparent PLA for the light parts; PETG should work as well.
Orange for the Gravity Gun as you first find it, light blue for the supercharged one. Only the five transparent parts change; try both in the viewer above.
No. The files are under the Printables Standard Digital File Licence: personal, non-commercial use only. No sharing, remixing or selling of the files or printed copies.
No. It’s a fan-made replica, designed from scratch and not affiliated with or endorsed by Valve.