INBXX PTFE Mount with Pneumatic Connectors with ECAS-04 or PC4-M10 on both ends

PTFE tubes are slippery AF.  With regular use, chances are high that the tube will slip in either direction, requiring repositioning.

The original mod placed a single threaded pneumatic connector at the rear, which stops slippage when feeding filament from INBXX to the print head, but not with filament removal.  I wanted to fix that by adding a second connector at the front so that the tube is completely stationary.  

I started my mod with a threaded version (PC4-M10) which is functional, but it protrudes a bit far and gets in the way of securing the screw.  It can still be tightened with the right tool, or just remove the front PC4 to secure the PTFE guide.  The front PC4-M10 does not thread all the way and will have some exposed threads (see picture).  Finger tight, and a turn or two with a tool should be enough; too much and it will crack.  It doesn't need to be tight.  The front is also angled slightly higher than the internal tube pathway in the mount.

The ECAS version is a much smaller footprint and is my preferred version.  The connectors should be able to be pressed in by hand.  Be careful to avoid cracking if forcing the connector in (a la table).  Make sure it's going in flat and slowly.  

The PTFE tubes are easiest to install if they're cut and meet near the middle (see pictures).  It can be done in a single piece, but the tube would have to be inserted from Front to Back due to the steeper angle on the front.  Having two pieces meeting near the middle will have the least resistance to filament if at all. 

If you're replacing existing PTFE mounts, you'll need to trim off about 6-6.5cm of your existing PTFE line.  This will be the piece that goes in the front.  Insert it in the front to where you want (leave about 1.5-2cm exposed).  Secure the PTFE mount screw, then push the remaining PTFE slack in the rear until it bumps into the front piece inside the mount.  The final position can be adjusted by pressing in the plastic collar on both ends at the same time.  If you're starting fresh, the PTFE tube can be all in one piece, inserted from the front first.  Cutting it would be easier though.

All modifications done in Prusa Slicer and are provided as 3MF project files because of the use of negative volumes won't translate to STLs.  I need to learn CAD, send help.  Adjust your print settings as needed.

Pictured (Overture PETG Black, Overture ASA Blue Diamond).  The black PETG ones were printed using the mod by fuchsr, and the wider version by HonzaJaros in blue ASA.  The cover photo shows the resulting PTFE angle equipped with filament, from L to R: default INBXX PTFE guide, ECAS Wide ASA mod, ECAS STD mod, PC4 STD mod.