Prusa MK3 Filament Guide

**Filament Guide for the Prusa i3 MK3 duel-spool injection molded filament holder**

I needed a simple filament guide to help keep filament from coming off the sides of full spools. This simple guide clips onto the lowest ridge in the injection molded filament holder that shipped with my MK3. There is a slit in the guide oval to allow you to insert the filament without having to disconnect an existing spool from the extruder.

I printed mine in PETG as that is what I had loaded, but this p