2/4/29 Update: I have added ParametricAutoRewindSpoolHolder_V1_11_90_axel_w_spacergroove, print and use this axel if you are using the univeal spool re-winder 12/9/18 Update: Opened up the left hanger like the right hanger to make it easier to drop spools in. Updated right hanger to include flat for bottom of axel. Hanging adapter for Parametric Auto-Rewind Spool Holder Should work with 8mm axels between 106-151mm long, mine is 134mm long. I used an 8mm M3 screw as a setscrew to hold the right arm in place. Used a medium sized 3m command strip to hold the PTFE wall mount (for guide) to wall.