Prusa MK2S PTFE tube guide

thingiverse

I use a 4mm PTFE tube (like this one: http://amzn.to/2tuMLzz ) to guide my filament into the printer. I use this tube so I could store my filament spool in a humidity-proof container. I used to have a problem where the PTFE tube would come at a sharp angle to the extruder, and sometimes the filament would break near the extruder because of that. I designed this guide to encourage the PTFE to have a gradual turn into the right angle required for the extruder. This guide snaps onto the extruder, and then you can just slide your PTFE tube through. (See pictures.)