BigBox Top-Mounted Filament/Spool Holder

When 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.

Edit: This is apparently only meant for the right side of the machine, due to different depths of the top piece of perspex. Ah well.

Note: This is meant to p