Substitute PVC pipe for Prusa-style filament holders

I didn't have a piece of PVC pipe handy when I was wanting to print with some sample filament on my Prusa i3 Mk2, so I "designed" and printed out this tube for my filament holder. It's hollow, of course, but I put some splines down the inside to strengthen it a bit.

It was probably overkill, but it filled a need and I still use it -- even though I now have a bit of PVC lying around.

The end hubs fit over the little spool nubs on the filament holders. I recommend this spool holder for t