Minimal PTFE/filament passthrough for enclosure panels

I didn't want to have to take my panels of the machine and do a lot of measuring and cutting to get a fancy PTFE pass through.  But I do have a 10mm drill bit, and that's all I needed (using a step drill is probably safer though).  

All the models here use printed M10 threads to clamp around/through the 10mm hole. Most decent printers can pull off (well enough) for M8 and bigger.  However, you may need to tweak flow rate or XY horizontal size compensation if your fit is too loose or too tight.  

Recommend printing in a material with good layer adhesion (PLA, PETG, TPU) due to thread print orientation.  ABS/ASA is probably fine if you don't tighten/clamp too hard, but I didn't try.

There are three main options here:

1. Use a PC4-M10 fitting on one side.  The internal cavity (of the fitting and the printed parts) is big enough to pass a single PTFE tube all the way through.
2. Use a PC4-M5 fitting on one side (the nut side).  Bolt side has 4.2mm hole for PTFE friction fit.  In this case only the filament can pass all the way through, you will need separate pieces of PTFE for each side.
3. Use a PC4-M5 fitting on both sides (both nut & bolt).  In this case only the filament can pass all the way through, you will need separate pieces of PTFE for each side.