MBot kit filament guide

MBot's recent inexpensive single extruder 3D printer kit is a hoot but it lacks an easy way to guide the filament from the rear spool hanger up to the extruder. After considering an up-and-over guide bar or full on overhead hanger I settled on the traditional 6mm x 4mm guide tube.

The rear panel is just a simple tube and two brackets. Print two copies of the rear bracket; it flips over to make the opposite end.

The extruder side fits in the gap in the sheet metal umbilical holder. Push in