Spool holder for Micromake D1 delta printer

This is an addition to the "Parametric universal spool holder" by rowokii, https://www.thingiverse.com/thing:767317

It allows the spool to be mounted on a M8 rod and be placed on top of the delta printer. The edges of the spool touch the horizontal beams thus preventing the spool from unwinding.

Use M4 screws and square nuts to fit it to 2020 beams. I advise not to tighten them so you could move the spool back and forth by hand if needed.

For larger spools you might want to edit the mo