Reverse Bowden for Prusa i3

Here's a reverse-Bowden setup for the Prusa I3 MK2 and MK3.

It's called "reverse-Bowden" because the extruder doesn't push filament through a PTFE tube into the hot-end. Instead, it pulls the filament through the tube.

There are a few advantages (real or imagined) to using a reverse-Bowden setup for the Prusa i3. It allows you to take the heavy filament spool off the frame. It eliminates the need for a filament guide. Also, travel movements of the print head don't cause the filament to