PTFE m10 guide MK3S magnetic

This is a remix of the filament guide which attaches to the MK3 frame.  The original had an m10 thread for a ptfe connector.  I wanted to make use of the DocWeebl's magnetic reverse Bowden swatch design so needed to remix the filament guide so that it'd take a 10mm x 3mm x 3mm ring magnet with pass-through to the ptfe screw thread.  So that's what this does: it lets you put a ring magnet at the top and thread an m10 ptfe connector underneath.  This means I can run ptfe from the extruder to the guide and then magnetically attach whichever filament I want to use to the top of it.  Model was bodged together on Tinkercad.  It didn't print too prettily but it gets the job done.