GrabCAD
Gears are used for transmitting motion, reverse the direction of rotation, increase or decrease the speed of rotation, to move rotational motion to a different axis. Here Spur gear is large gear, pinion gear is small gear. By this the motion study of spur pinion gears is studied.
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This model is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Check the license (see original page) on the original GrabCAD page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.