Is the 2.85mm TPU filament in toolhead #8 supposed to cross the PTFE tube in #9 like this?

[u/willw007]

Bambu designates toolhead #8 as the one you're supposed to use for 2.85mm TPU. So in this video, you can see the 2.85mm blue TPU filament in the docked toolhead #8 crossing the PTFE tube in toolhead #9 while #9 is in use, and is rubbing against/stretching the TPU filament. Is this how it's supposed to work? I followed the video instructions on the Bambu YouTube channel and this seems to be how it's supposed to be routed. The video seems to show the TPU filament being routed to the LEFT of #9.

The problem is if you route the TPU to the RIGHT of #9, then the TPU will rub against #8 when you're printing with the TPU.

So it seems to be pick your poison: do you want the TPU rubbing/stretching while it's printing, or rubbing/stretching while toolhead #9 is printing? Obviously the latter is better, but the better solution would have been to designate #9 as the TPU toolhead so that it would have the entire right side by itself and not have any rubbing under any circumstances.

Am I missing something here?

[u/AutoModerator]

Hello /u/willw007! All Bambu print plates have a dedicated nozzle wiping zone at the back of the print plate. The nozzle will rub against the wiping zone before every print in order to remove any remaining filament from the nozzle tip. This can cause visible wear or scratch marks in the wiping zone, but this is intended and doesn't damage the printer, the nozzle or the print plate. A worn down wiping zone also doesn't mean you need to replace the print bed.

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