Flexible helical z-wobble coupler for printrbot jr v2, 5mm to 3/8in

thingiverse

Heavily customized version of http://www.thingiverse.com/thing:143514 Base mesh created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=143514 Used Blender.app to make boolean screwholes and compression gaps, and fine-tuned mesh size by trial and error. Mostly eliminates my PBJV2 z-wobble. To Print: You MUST print with support; print with support "lines" instead of "box" support. Carefully remove support after printing. To use: Remove old coupler; attach coupler to 5mm shaft of Z-motor. Carefully lower the main carriage so the Z-shaft goes into the top of the coupler. Leave a space inside the coupler between the top of the motor shaft and the bottom of the Z-shaft. Use a 5mm wide rubber band and insert it into the spiral; this prevents vibration and stops the spiral from compressing. Use a shorter M3 screw than I used, so it doesn't stick out and knock against the linear bearings, or catch on the wires of your heated build plate. Instructions Using the following options: $fn = 100 length_bottom = 10 length_top = 10 screw_diameter = 0 helix_length = 10 hole_dia_bottom = 5 coupling_outer_dia = 20 hole_dia_top = 9.53