PTFE/Wire Harness Support Arm  

RE: PTFE/Wire Harness Support Arm

That swing arm has even been in the spotlight as "Part of the Core One philosophy":

https://blog.prusa3d.com/prusa-core-one-january-update-its-just-around-the-corner_108917

RE: PTFE/Wire Harness Support Arm

Funny, the philosphy included a proper screw and nut, not the included garbage

RE: PTFE/Wire Harness Support Arm

One thought: If the "L" is like standard Core one, the swing arm can be turned slightly on the back wall after loosening the screws that hold it. It's only a few degrees, but over the length of the swing arm it may be enough to stay clear of the fan.

RE:

Thanks, it is a 3 screw design, no rotation possible. After printing overnight, it is hitting again, but at least the arm is not drooping.

https://storage.googleapis.com/prusa3d-content-prod-14e8-wordpress-forum-prod/2025/12/d0d078a4-hitting-fan.mp4

RE:

Prusa support was useless as usual and needed to get back to me. Doubt they'll have any real solutions to a clear design issue. This mod seems to be the answer for now.

https://www.printables.com/model/1524157-swingarm-extend-core-one-l

RE: PTFE/Wire Harness Support Arm

This is Prusa's answer to the wire harness/ptfe tube getting caught on the corner of the fan.

https://help.prusa3d.com/guide/6-nextruder-assembly_982284#994919

RE: PTFE/Wire Harness Support Arm

The Swing Arm extension, which worked great, did not last long before breaking.

RE: PTFE/Wire Harness Support Arm

This fixed it brilliantly . https://www.printables.com/model/1410439-core-one-mmu3-extruder-cable-sag-solution-only-tyw

RE:

Thanks I'll check that out. I had tried some zip ties, but I didn't have anything of that size.

Posted by: @malcb37

This fixed it brilliantly . https://www.printables.com/model/1410439-core-one-mmu3-extruder-cable-sag-solution-only-tyw

RE:

Here is using Prusa's completely ineffective solution, then thier is my ugly, but working solution for the moment.

RE: PTFE/Wire Harness Support Arm

For extra insurance at this point I made a wire harness fan guard 

https://www.printables.com/model/1547068-core-one-l-wire-harness-fan-guard

RE: PTFE/Wire Harness Support Arm

Here is another fix until Prusa Solves their design problem.

https://www.printables.com/model/1548181-core-one-l-swing-arm-bowden-support-clip

RE: PTFE/Wire Harness Support Arm

also make sure that the PTFE tube doesnt touch your belts, i had that before too

RE: PTFE/Wire Harness Support Arm

I ran across this issue as well and modeled up this fix, it doesn't require any tools and just slips over the fans in place.
https://www.printables.com/model/1573195-core-one-l-exhaust-fan-cable-guard

RE: PTFE/Wire Harness Support Arm

Everyone needs to open a ticket for this issue.

"Unfortunately the product specialist review requires escalation through other production and test departments and is talking much longer then expected. At this point, it will likely require a few weeks since there doesn't seem to be severe concern based on our preliminaty tests.I will try my best to excalate during the next few weeks though."

RE:

Regular core one: Same problem, resulting in layer shifts.

Nothing a chopstick in the right place couldn't fix...

https://forum.prusa3d.com/forum/user-mods/core-one-chopstick-mod-umbilical-x-motor-jamming/#post-768642

BTW the above mod has been working without any issues or further attention since I posted it.