Looking for Planetary gearbox scifi gear? Get this 3D model from CGPdesign via CGTrader for $75.
STL (Stereolithography, filesize: 150 MB), OBJ (OBJ, filesize: 36.2 MB), FBX (Autodesk FBX, filesize: 14.1 MB), MAX (Autodesk 3ds Max, filesize: 18 MB), STP (STEP, filesize: 21.9 MB), SLDPRT (SolidWorks, filesize: 21.9 MB), 3DS (3D Studio, filesize: 7.21 MB)