mechanical component CAD Models
Browse mechanical component CAD models used in real projects. Preview online and download STEP/STP, IGES, STL and more. Filter by category, file type, price and popularity.
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.
iPhone Accessory & Case Design Kit
A practical iPhone accessory cluster for designing cases, charging stands, holders and fit-checking around real phone geometry.
250 mm FPV Drone Build Kit
A complete FPV quad build cluster covering frame, propulsion, camera, control electronics, battery housing and mounting hardware.
NEMA 17 Motion / Linear Actuator Kit
A motion-control cluster around a NEMA 17 stepper, bracket, coupler, GT2 belt, pulley, bearing and driver.
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 Built