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need:608 bearing - 3 pcs688 bearing (8x16x4mm) - 2pcsM3x10mm bolt - 3 pcsself-locking nut M3 - 3 pcs
Side gears are the same as in my gear spinner.
Dimensions for bearings in stl-files:d608 = 22.05;dIn608 = 7.9;
// center bearingd688 = 16.05;dIn688 = 7.95;
with cura and nozzle 0.3 I get a good tight fit bearings without backlashes, and without the press, bearings are inserted by hand.