Bowdentube+Cable scrape over enclosure fan during print
When printing, the bowden-tube + nextruder-cable bundle gets behind the upper left corner of the enclosure fans.
When the nextruder then travels to the right, the bundle "jumps" over that corner.
It's not really "stuck" as it seems to come lose quite quickly.
This doesn't seem to have any impact on print quality.
I'm also not concerned much about something wearing out as all involved components seem to be sturdy enough and I don't expect a lot of force being applied to any of them.
I just got worried from the unusual noise when I first noticed it and just wanted to confirm that others are experiencing this as well and that it's not something I did wrong during the conversion from the MK4S.
Just for completeness sake: I also have the MMU3 upgrade with the hood, but that doesn't seem to play any role in this.
If this is supposed to happen, I'm considering to design a piece which can be attached on top of the fans to offer a gradual slope for the bundle so that it slides over the edge smoothly and doesn't "snap" over it. That should remove the noise.
Any thoughts on that from anyone?
Cheers
nomike
RE: Bowdentube+Cable scrape over enclosure fan during print
I have exactly the same problem. So much so, it pulled off the printer fan.
RE:
The Bowden tube acts as a rigid spine to prevent the main umbilical cable from sagging and getting jammed against the frame or the X-motor. Make sure it's oriented in the correct way and that the tie wraps are in the correct locations. Also make sure the first tie wrap on the swing arm closest to the hinge is not wrapped around the Bowden tube as in this photo
Also, need to make sure the tie wrap that holds down the fan screen is oriented correctly and that it's pushed down enough that it doesn't run into the fan. My suggestion is to print a replacement Prusa CORE One Fan Grid Replacement with PC-CF (if you have it) or PETG (definitely not PLA) and ensure that the tie wrap is positioned correctly as in this photo, the clasp part of the tie wrap should be facing toward the fans with the thermistor pointing into the chamber. Check the instructions here 29. Assembling the fan grid
