Prusa I3 Filament Tube Guide

updated - Added a screw hole and modified it a little to add some clearance for my Prusa with the Z belt.

This tube guide works by clipping onto the horizontal top of the Prusa I3 modded Laser cut model. A standard water / ice maker tube works and the hole is chamfered to allow the tube to follow the extruder as it moves when it is higher up.