Printrbot Simple z-coupler

thingiverse

To resolve z-wobble on my Printrbot Simple, I designed a custom coupler shorter than the original, avoiding y-axis motor interference. The flexible coupler is assembled by inserting the tube into the smaller side and adding the lead screw to the other end, secured with 4 M3 x 20 screws and nuts. Longer springs are required for extruder contact with the bed, along with 4 M3 X 30 screws; if longer springs aren't available, print M3 spacers as an alternative.