Free Mechanical & Engineering Models

Gears, Tesla valves, linkages, and print-in-place mechanisms

Some of the most fascinating 3D prints are the ones that move or demonstrate a principle: planetary gear sets, Tesla valves, compliant flexures, cam mechanisms, and print-in-place linkages. They are equal parts desk toy and engineering lesson.

This collection gathers free mechanical and engineering 3D models: working gearboxes, fluidic Tesla valves, flexure mechanisms, cams, and demonstration models. Every file is free to download from the original creator's listing.

Mechanical prints reward a tuned printer: run a tolerance test first so gears mesh and joints move freely. Print at 0.12 to 0.16 mm layers, and keep clearances generous on any part that needs to rotate.

40 trending picks

Flying Sea Turtle 3D model
Flying Sea Turtle
Thingiverse · amaochan
 Fully 3D-printable wind-up car gift card 3D model
Fully 3D-printable wind-up car gift card
Thingiverse · Bribro12
 Gear Bearing 3D model
Gear Bearing
Thingiverse · emmett
 3D-printable Davinci catapult gift card 3D model
3D-printable Davinci catapult gift card
Thingiverse · Bribro12
 Watch Escapement Desk Toy 3D model
Watch Escapement Desk Toy
Thingiverse · LarkysPrints
 3D printed mechanical Clock with Anchor Escapement 3D model
3D printed mechanical Clock with Anchor Escapement
Thingiverse · TheGoofy
 Toyota 4 Cylinder Engine 22RE, Complete working model 3D model
Toyota 4 Cylinder Engine 22RE, Complete working model
Thingiverse · ericthepoolboy
 Predator Action Pliers 3D model
Predator Action Pliers
Thingiverse · ecoiras
 Fully 3D-printable turntable 3D model
Fully 3D-printable turntable
Thingiverse · Bribro12
 Icosahedron Gears Fidget Toy 3D model
Icosahedron Gears Fidget Toy
MakerWorld · bensbigolbeard
 Vice mechanical v2.0 3D model
Vice mechanical v2.0
Thingiverse · swlesson
 Elliptical Gear with no center pivot 3D model
Elliptical Gear with no center pivot
Thingiverse · cohlwiler
 PRINT-IN-PLACE SPRING LOADED BOX 3D model
PRINT-IN-PLACE SPRING LOADED BOX
Thingiverse · Turbo_SunShine
 GEARBOX 3D model
GEARBOX
Thingiverse · mijael08
 Print in Place Geared Hinge 3D model
Print in Place Geared Hinge
Printables · E. Soderberg
 Retracc: The Retractable Karambit Knife [Now With Magnets!!] 3D model
Retracc: The Retractable Karambit Knife [Now With Magnets!!]
Thingiverse · BiscuitsOnTheFloor
 Wall Fixing 3D model
Wall Fixing
Thingiverse · ZacSimmo
 Iris Door Box v3 3D model
Iris Door Box v3
Thingiverse · countspatula
 Squishy Turtle by jakejake 3D model
Squishy Turtle by jakejake
MakerWorld · TmnRsmn
 Triaxial Tourbillon Clock Make/Mods 3D model
Triaxial Tourbillon Clock Make/Mods
Thingiverse · mcmaven
 Open Source Universal Ball Joint (to reuse!) 3D model
Open Source Universal Ball Joint (to reuse!)
Thingiverse · DieZopfe
 Arduino controlled photogrammetry 3D-scanner 3D model
Arduino controlled photogrammetry 3D-scanner
Thingiverse · Bribro12
 Kinetic Box - Mobius Kaleidocycle by Degrees of Freedom 3D model
Kinetic Box - Mobius Kaleidocycle by Degrees of Freedom
Thingiverse · emancarrillo
 (Updated) Mechanical Iron man SD Card Holder 3D model
(Updated) Mechanical Iron man SD Card Holder
Thingiverse · ExtraChegg
 Beer Counter V3, Bottle Opener 3D model
Beer Counter V3, Bottle Opener
Thingiverse · RubenMts
 Getriebe Bibliothek für OpenSCAD / Gears Library for OpenSCAD 3D model
Getriebe Bibliothek für OpenSCAD / Gears Library for OpenSCAD
Thingiverse · janssen86
 Predator Action Pliers Mk2 3D model
Predator Action Pliers Mk2
Thingiverse · ecoiras
 Helical Gear Fidget Toy 3D model
Helical Gear Fidget Toy
Thingiverse · spingoogL
 N-JOINTS 3D model
N-JOINTS
Thingiverse · Nurgo
 Mechanical Keyboard - SiCK-68 3D model
Mechanical Keyboard - SiCK-68
Thingiverse · FedorSosnin
 Hose Clamp - Pinch Valve 3D model
Hose Clamp - Pinch Valve
Thingiverse · Tim_C
 Working Gear Driven 4WD Toyota Transfer Case Model 3D model
Working Gear Driven 4WD Toyota Transfer Case Model
Thingiverse · ericthepoolboy
 Sorting Tray with Funnel 3D model
Sorting Tray with Funnel
Printables · Area51
 Mechanical Iris 3D model
Mechanical Iris
Thingiverse · sketchpunk
 Fidget Gears - Print in Place 3D model
Fidget Gears - Print in Place
MakerWorld · NinjaDuck Prints
 Creality Ender-3 ButtonBox (for OctoPrint) 3D model
Creality Ender-3 ButtonBox (for OctoPrint)
Thingiverse · Matereo
 Mechanical Laser Show 3D model
Mechanical Laser Show
Thingiverse · AdditiveTech
 DeSteiner Model 1887 - mechanically working Winchester lever action Prop Gun 3D model
DeSteiner Model 1887 - mechanically working Winchester lever action Prop Gun
Thingiverse · Steiner3D
 Ender 3 Extruder Gear - Imperial edition 3D model
Ender 3 Extruder Gear - Imperial edition
Thingiverse · venegade
 TT Furious Tourbillon 3D model
TT Furious Tourbillon
Thingiverse · mcmaven

Frequently asked questions

Are these 3D models free to download?
Yes. Every model in this collection is free to download from the original creator's listing on platforms like Cults3D, MyMiniFactory, Thingiverse, Printables, and MakerWorld. Thinger links you to the source; it never re-hosts files.
How is this collection curated?
Models are matched to this topic automatically and ordered by how often Thinger users save them, so the list updates as new models trend. Check back for fresh picks.
What do I need to print these models?
Any home FDM or resin 3D printer works for most models here. Open the model page for details, then grab the file from the original listing and check the creator's suggested print settings.

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