Economic 5DollarFilament spool adapter for RepRapGuru Prusa i3 v2

The spool holder which mounts onto the back of the RepRapGuru Prusa i3 acrylic frame isn't compatible with ProtoParadigm's 5 dollar filament, and I didn't want to print out a large custom spool to fit over the 5DF spools.

I had a PVC pipe that measured 1 1/16 inches in diameter, so I designed something to take advantage of that.

I don't know if the acrylic spool holder comes with other printers than the RepRapGuru, but if it does, this spool adapter should work just as well for those.

Update 2017/04/10: Added pvc-rod-spacer to fix a problem with the arms of the ProtoParadigm spool catching on the screws protruding on the inside of the printer's acrylic spool holder. Also added a solid rod model so you can set your own wall thickness.