Prusa I4 Spool Holder

Well, I finally got tired of having my filament trail up and then down my printer and bounce against the back of the Prusa I4 screen, so I decided to go ahead and make a spool holder to solve both issues.

The tolerances are kind of tight on the spool pin, but just slide it back and forth a few times should make it easier to detatch.

I am kind of guessing that all I4s have the same dimensions, sorry if they don't.
Mine uses 20mm rails.

It is just the right size to set a couple up on the top of the printer. (just in case someone wants to get a super wide spool :P )