I designed and printed a spool holder yesterday so that I can recycle a dual-monitor stand. It uses the standard VESA mount and accommodates the 6-32 aluminum bolts which I have. I'll need to print a second one for the left holder, of course. About 14 hours with a 75% infill in standard PLA. Being a big part, I assumed it would curl but it tightens up nicely once mounted to the steel frame.