True Top Filament Guide Mod for Prusa Core One

This mod will add a top filament guide with internal routing. This allows you to put several Prusa Core Ones side by side with no gap. Filament also feeds way better.

This is primarily based on @imax_3194961s model which needs to be printed and installed also: https://www.printables.com/model/1358554-core-one-filament-sensor-splitterdual-ingress-with

Things you will need for this mod:

• 290mm x 2.5mm x 4mm PTFE tubing
• 32mm x 2.5mm x 4mm PTFE tubing
• 34mm x 2.5mm x 4mm PTFE tubing
• 38mm x 2.5mm x 4mm PTFE tubing
• 4 x PC4-M10 push fitting connectors
• 2 x M3-0.5 x 10mm socket head screws
• 2 x M3-0.5 x 3.2mm threaded brass heat inserts
• 5 step 4mm-12mm STRAIGHT step drill. (a spiral flute WILL crack the acrylic)
• 3mm drill bit
• A small drill driver and a small file to deburr the drilled holes

Print out the all the parts, including @imax_3194961s mentioned above. PETG with 0.2mm layer height should be fine, use something heat resistant.

I think the pictures should be enough guidance, but here are the steps in words:

1. Undo the top cover, side cover and the right side panel. Undo the old filament sensor.
2. Move all the internal parts of the old filament sensor into the new one. You might have to cut the plastic to extract the magnets and nuts.
3. Install the 34mm and 38mm tubes into the new filament sensor, see picture. Install two PC4-M10 connectors.
4. Cover the entire bed with some cloth as we are about to create metal chips inside the printer.
5. Drill a 8mm hole with the step drill as seen in the pictures. 
6. Deburr the top of the hole with a file
7. Install the new filament sensor and put back the side panel
8. With the acrylic cover in place use the template and locate it using one of the M3 screws, placed in the center. We use the template to drill out two holes which will hold the adapter in place. Refer to the pictures.
9. Drill the first hole with the 3mm drill.
10. Now place the second M3 screw in the hole you just drilled and then drill the second 3mm hole.
11. Remove the template and now open up the original hole (now the center one) with the strep drill to 10mm. BE CAREFUL and GO SLOW as to not crack the acrylic. Make sure you hold down the acrylic firmly while drilling.
12. Deburr the holes you just drilled with a file or countersink so that the bottom is completely flat.
13. Install the heat inserts into the bottom part.
14. Install the the two parts with the M3 screws as seen in the pictures.
15. Install the 32mm PTFE tube as seen in the picture.
16. Install the PC4-M10 push fitting connectors.

Done!  It took me about an hour to do this mod.

UPDATE: I added a few version with different in-feeding angles but you will need to adjust the PTFE tubing accordingly since I have not tested those.