Mechanical Parts STL Files

Mechanical part STL files for 3D printing: gears, shafts, pulleys, couplings, discs and guitar tuning parts. These functional parts are for repairs, prototypes and moving builds. Examples include the plastic pulley and a small gear. Every model is a digital file, so you print it at home on your own FDM or resin printer.Print gears flat on the bed with 100% infill or 5 walls so the teeth stay strong. PETG or nylon wears better than PLA in moving parts. Holes often print slightly small, so test fit first, then ream them with a drill bit for a clean fit. Add a little grease or dry lubricant to printed gears and bearings so they run smoothly. Print a single test gear before a full set to check that the teeth mesh well.New to functional prints? Read our step-by-step guide to printing an STL file.