Flexible Shaft Coupler/Adapter
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I created this shaft coupler to link a NEMA-23 stepper motor to a ball screw drive that previously utilized a NEMA-34 servo motor. It was engineered to fit the motor mount that came with the screw drive, but all dimensions can be easily modified in DesignSpark Mechanical to accommodate any size shaft and overall length and diameter. I exported in Cura and employed the "everywhere" support option. I printed at 50% infill, 0.2mm layers. Once the print is complete, you will need to invest some time prying out the support material from the spiral slots, but it's not overly challenging if you use a scraper or knife. Be cautious not to cut your hands in the process!
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