Printrbot Simple Z Coupler

thingiverse

To resolve my z-axis slippage issue on a Printrbot Simple BETA, I designed a tight-fitting coupler. Printing it with 2 extra walls and 20% infill at 0.2 layer height, you can either use a printed nut or purchase one for better hold due to its snug fit on the rod. Secure the coupler on the motor shaft using two M3x10 bolts, and tighten an additional nut against the coupler to lock it onto the threaded rod.