Just Another Coupler 5mm to 8mm

thingiverse

Others have made them too, and I've printed them out myself... and the ones I've printed have consistently failed in the middle of the print process. I think this design will have a much higher success rate because it eliminates all the failure points that the other designs I've used had. It uses actual metal nuts in the provided openings that can be placed after printing, along with either 3 or 4mm set screws. I've also included couplers that accept either 2 or 4 nuts. As always, I've included source files for easy customization in the form of STEP (.stp) files. STEP files can be opened in a variety of different CAD packages, such as AutoDesk's free to use Fusion 360 software. Print on! The IDs have been slightly oversized because my printer tends to print IDs a bit small. This is intended to be used with a 5mm stepper motor's drive shaft and an 8mm lead screw. The actual IDs of the design file are 5.3mm and 8.3mm respectively. As long as you're printing one, print two. That way if one fails, you have a spare to print more of these couplers!