MK3S+ MMU2S Filament Sensor Cover With threaded (M10x1.0) Bowden Tube Passthrough

This isn't a new idea, but I couldn't find an updated Bowden passthrough model for the latest MK3S+ MMU2S raised filament sensor so I took the original and made my own. This also includes an updated adapter that goes below the fs-cover. I was able to remove my original by lightly loosening the top two screws on the backside, and the front two just below the extruder stepper. This adapter allows the tube to pass all the way through and 6mm into the adapter. I found this easier to get a nice smooth path without any snags. It is slightly oval allowing the filament sensor to be adjusted.

The idea is to reduce the friction and create as smooth a path as possible from the MMU down to the Bowden Gears. 

These don't need to be printed in PETG, but it is close enough to the heat source that it is a good idea to use a higher-temperature filament.  The included G-code uses 0.07mm so the threads are more accurate. I printed mine at 0.05, it is short enough that one is not looking at a huge print time.

The big thing is that these parts cannot be warped. As always with printed parts, a light sanding/filing/de-burring/chamfering goes a long way to this making a difference.

If you replace anything in the path between the MMU and Bowden gears that changes the length you should recalibrate the MMU using the link below. (Hint, you will likely change the length if you do this mod)

I included a link to an example of the Bowden Tubes I used. They aren't the best I've used, but they seem to be consistent.

I included a few popular formats for this so people can remix. I've included a link to the model at Autodesk too.

Also included is a link for a tapered reamer that works really well for opening the ends of the PTFE Bowden tubes, as well as the entrance/exits in the printed plastic parts.

Adjusting Bowden Tube Length MMU:
https://prusa3d.dozuki.com/Guide/Service+menu+-+Individual+Filament+Calibration/842
Bowden Tube/Fittings (Amazon US):
https://www.amazon.com/gp/product/B098QL6Y58
Reamer (Amazon US):
https://www.amazon.com/gp/product/B01EIH573K
Original idea:
https://www.thingiverse.com/thing:3129388
My Autodesk Models:
https://a360.co/32Vg2Wh