Filament Guide for the Prusa i3 Mk2

After printing a spool holder, I needed a thing to feed my wire, this is what I came up with. It sits on the top bar of the printer, with the filament going though the hole.
*Edit* It's a little small in the slot. The hole is a bit small too. I drilled the hole a little bigger and just set the piece about 50% down on the top of the printer.