CFS Roller Mod Remix For Standard Hardware

June 21, 2025 Update

I added a looser tolerance for the Spacer Bushing and Thrust Washer.  I noticed when assembling that I needed to thread those onto the screws before inserting the whole sub-assembly into the Bearing Roller.  It wasn't a problem for me, but time consuming.  So I added these files as an option for others to use.

So far the system seems to be working well and there is very low friction, which is what I was after.

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I was having some trouble sourcing the shoulder bolts called for on the original design.  But I liked the design better than the one it was remixed from.  So I made a few changes and optimized it to be printed on a standard Bambu P1S.  I added the .3mf files for the P1S using PETG to the files section as well.

The key settings I used were:

• layer height: 0.2mm
• Arc Fitting: on
• Precise Z Height: on
• Wall Generator: Arachne
• Wall Loops: 3
• Enable Support: off (it'll throw an error, but prints fine)
• Brim Type: Auto

I used PETF GF (this one to be precise).  I found that it's a great price, dimensionally stable and strong.  I also love the matte finish.  I'm sure regular PETG, ABS or other filament could be used as well.  I might avoid PLA just because of how brittle it can be.

The 4 parts loaded have been remixed to support the use of standard M3x35 bolts in lieu of shoulder bolts.  You probably only need the Spacer bushing remix, but I touched all of the 4 parts below with minor mods noted.

• Spacer Bushing Remix (Distanzbuchse)
  • Remixed ID to match standard M3x35 bolt.
  • extended to fit inside bearing.
• Bearing Roller Remix (Lagerrolle)
  • I found the press fit of the bearing to be a little too tight so I opened the ID just a little.
  • I opened the hole on the end need the clamping bush to prevent contact with the clamping bush.
• Thrust Washer Remix (Druckscheibe)
  • I made this a little larger.  No big change.
• Clamping Bush Remix (Klemmbuchse)
  • I added the hex recess on the side near the arm, and reduced the dimension to provide a little more clearance to the roller.

I may revisit this design at some point to see if there's a way to simplify it further.  I'm a fan of the KISS approach to design, and this particular design has quite a few parts and pieces. It's very functional and well thought out, I just wish there was a simpler design with a reduced parts count.

Please let me know what you think and if there are any changes needed.

Thanks!