MK4 Nextruder Festo Passthrough - Magnetic

Created this model because filament tips would frequently get stuck on the threads built into the top of the Nextruder heatsink. I think this occurs when the Festo tube between the MMU3 and the Nextruder is in certain orientations, affecting the entry angle into the Nextruder. Either way this caused failed loads and filament grinding in the MMU3 for me. This part enables the Festo tube to be pushed into the Nextruder heatsink, bypassing the threads. Since I have been using it, I haven't needed to make any interventions with my MMU3.

Hardware:

1x - Passthrough Festo PC4M10 - https://www.amazon.com/dp/B01KHN1HWY/

16x - 6x3 Rare-Earth Magnets - https://www.amazon.com/gp/product/B08F9XB8DG/

Links are what I used, you can probably shop around for better deals or different quantities depending on your needs.

Print/Assembly:

1. Print the two parts with the magnet-holes facing upward. Both parts will require support under the bridging above the build plate. I used PETG, 0.2mm layers, and 30% infill.
2. Use a marker to label polarity on the 16 magnets. Make sure to mark the same pole on each magnet.
3. Grab the Festo printed part and a tube of superglue.
4. Place a small bead of superglue on the marked side of one of the magnets.
5. Position another magnet on the bead of superglue, you should now have a magnet sandwich. Don't wait for the glue to dry, excess glue will help adhesion with the sides of the magnet holes.
6. Place another small bead of superglue on the unmarked side of the bottom magnet and press it into one of the magnet holes on the Festo printed part.
7. Repeat steps 4-6 for the other three holes in the Festo printed part.
8. Grab the Nextruder printed part.
9. Repeat steps 4-7, except use unmarked side for step 4 and marked side for step 6.
10. Glue the Nextruder printed part onto the top of the Nextruder heatsink. Don't use too much glue and place it in the corners to avoid blocking the path for the Bowden tube. After placing the glue, press the printed part onto the heatsink with a bit of force. There should still be a gap between the bottom of the printed part and the sliding idler tension assembly to eliminate additional friction. Allow the glue to set in all the parts before continuing.
11. Thread the PC4M10 Festo fitting into the Festo printed part.
12. Place Festo printed part in position, magnetically attached to the Nextruder printed part.
13. Remove the Bowden tubing from the default MK4 Festo fitting.
14. You may need to file the outside of the Bowden tubing to smooth it if the default MK4 Festo fitting has cut a groove into the tubing.
15. Press the tubing through the PC4M10 fitting until it stops inside the Nextruder. When the Festo printed part is disconnected, about 6.5mm of the Bowden tube should be visible.
16. Assembly done! You have now bypassed those pesky Nextruder threads and toolchanges should be smoother from now on. Happy printing!