Z Rod Coupler: 4.5mm flat motor shaft to 5mm threaded rod
thingiverse
For Nema17 motors with a 4.5mm flat sided shaft to a 5mm threaded rod. Use M3 10mm hex bolts together with M3 lock nuts to screw the pieces together. Print Settings Printer Brand: RepRap Printer: P3Steel Rafts: No Supports: No Resolution: 0.3mm Infill: 10 Post-Printing Inner holes measure 4.9mm. Should be no need for filling material like rubber tubing when installing. Let me know how it works out for you though, maybe we need to cut it down to 4.8mm : )
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