SummaryWhen printing with NinjaFlex, the up-from-the-back tube really doesn't help, so I made this to top mount the spool (easier than the rear mount anyway). This is made to width for the ninjaflex spools, you can change the width to accommodate. Rod is a piece of 3/4" PVC trimmed to fit. I suspect you could fit 4-6 of these on a machine. Note: This is meant to print with supports under each of the hooked arms and under the archway between spool legs. Also, there is a pocket on the frame of the spool holder on the outside of the machine - this is meant to eventually have something hooked onto it like a tool holder, etc. Do with it what you will.