Free
Engineering CAD Design Library
Browse quality-checked 3D CAD models for engineering, product design, prototyping and manufacturing. Preview models online and download files in STEP, STP, IGES, STL, OBJ, PLY, DWG, DXF and more.
Browse by part & function
The axis engineers actually search on — pick a part type to filter the catalog.
Build kits
Curated systems with verified mating parts — download the whole assembly at once.
CONSUMER ELECTRONICS
iPhone Accessory & Case Design Kit
A practical iPhone accessory cluster for designing cases, charging stands, holders and fit-checking around real phone geometry.
DRONES / UAV
250 mm FPV Drone Build Kit
A complete FPV quad build cluster covering frame, propulsion, camera, control electronics, battery housing and mounting hardware.
MOTION CONTROL
NEMA 17 Motion / Linear Actuator Kit
A motion-control cluster around a NEMA 17 stepper, bracket, coupler, GT2 belt, pulley, bearing and driver.
HARDWARE
Metric Fasteners & Threaded Hardware Pack
A reusable ISO/metric fastener library cluster with screws, nuts, washers, inserts, standoffs and bolt assemblies.
3D PRINTING
3D Printer Motion & Extruder Upgrade Kit
A 3D-printer upgrade cluster combining hotend parts, filament handling, stepper drive and motion hardware.
ELECTRONICS PROTOTYPING
Arduino / ESP32 Prototyping Kit
A maker electronics cluster with Arduino, ESP32, breadboard, shield, servo, battery holder and enclosure.
ROBOTICS
Robotic Arm + Gripper Kit
A robotic manipulator cluster with 6-DOF arm, gripper, wrist, servo mounts, actuator and linear guide components.
CNC MACHINING
CNC Workholding & Tooling Kit
A CNC machining cluster covering table, clamping, vise, chuck, collet holder, spindle and ball-screw motion.
HVAC / DUCTING
HVAC Ventilation Duct Assembly Kit
A ventilation product cluster with grille, damper, duct adapter, fan, filter, flange and duct clamp.
FLUID POWER
Hydraulic / Pneumatic Pump & Valve Manifold Kit
A fluid-power cluster combining pump, valves, pressure gauge, manifold block, pipe and coupling parts.
MOBILE ROBOTICS
RC / Line-Follower Robot Chassis Kit
A small mobile-robot cluster with chassis, wheels, hubs, motors, motor mounts, controller, battery holder and damper.
WORKSPACE ACCESSORIES
Desk Cable + Phone Stand Workstation Kit
A desk-organization product cluster combining cable routing, phone holders, headphone stands and laptop/iMac stands.
CAMERA / IMAGING RIGS
Camera Gimbal & Mount Rig Kit
A camera-rig cluster with gimbal, camera modules, tripod, tilt head, GoPro mount and camera bracket parts.
9989 models2D drawings
Free
$5
$50
Need a CAD file that is not in the library?
Share your requirement and Marathon OS will match you with a vetted CAD designer for production-ready CAD files, edits and manufacturing documentation.
Get it Built500+Projects Done
24 hrResponse
15+CAD Tools
$22
$7
Browse CAD models by file format
Browse CAD models by category
$88
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
The CAD marketplace for modern teamsAsk a question
