Holds PVC pipe up so you can use it for a spool holder. Make sure the OD of your PCB is 27mm. I will later make another version in SCAD so people can customize the diameter.
Drill a hole through the side with the pipe in place for a bolt to stop it from turning.
I used 35% infill, 0.25mm layer height, 0.4mm nozzle
and PLA filament with success.