NEMA17 Planetary Gearbox

This model is a very compact motor-reducer, with precise movement and without backlash. The overall height is 29mm, only 6mm more than the motor shaft. The reduction ratio is (1 + 38/14) : 1 , roughly 3.7 : 1

Print instructions The model is designed for SLA printers, but a good FDM printer can do the job either. For SLA printers - Print the Full Assembly.3mf file, arranging the parts on the build plate (no print in place) - Use the slow print profile to get maximum dimensional precision - Print the parts with an engineering resin, such as SUNLU nylon-like resin or JAMG-HE Conjure Rigid resin

For FDM printers - Print the Full assembly (for FDM printers).stl file, arranging the parts on the build plate (no print in place) - Use an high precision, low layer height print profile

Build instructions Screws - 4x M3x6 hex socket head - 4x M3x8 hex socket head - 4x M3x20 hex socket head - 4x M3 nut

Mount the rotor first, taking care to insert the box lid between the planets section and the end section. Secure the 3 rotor sections using the 4 20mm screws. Place the rotor into the box and insert the central gear on the motor shaft. Fix the box to the motor using the 4 6mm screws: put them in position in the 4 corner housings with the help of tweezers and tighten them by inserting an allen key in each of the 4 holes of the cover. Finally, insert 4 M3 nuts into the 4 corner slots of the box and secure the lid with the 4 8mm screws. Lubricate abundantly all the moving parts with lithium grease or similar.