Also remember there is a problem with mixing material type in a single nozzle. The purge is not full and will change the chemistry/behavior of the plastic.

The new multi nozzle Bambu suggests using the alternate single filament nozzle for a different material type.

I think it was a video about the h2d from 3d printing nerd talking about this.

https://youtube.com/@3dprintingnerd

I’ll start with I’ve never actually tried using tpu despite having a roll. I also have a second non mmu printer.

What I do know is there there are multiple levels of softness with tpu. I think I was watching a video about the Prusa Core One, talking about how it handled tpu, and they needed to step up from super soft 60 to less cooked spaghetti like 90 just to feed up the tube and to the print head.

I also remember the MMU settings in the firmware have a material type option per input. I don’t recall if TPU is on the list, but most others are fine without changing this setting, so maybe?