My V3 SE has decided that it wants to underextrude TPU. Totally fine with PLA/PETG can’t see what setting could have gone wrong. It isn’t really a problem as my Ender 5 plus quite happily printed what I needed but it was a different roll of filament, same make on both machines but on the SE it is fairly end of roll, left it to dry for a few hours made no difference.
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Limit the flow rate to 4mm³/s and see if it prints better.
The default setting on the SE and KE is 3.5mm³/s but on the 5 plus it is 10mm³/s. Might try them all at 10mm³/s not noticed they were different before.
I’m having the same problem too Works perfectly fine with any other material, except TPU which it used to print no problem with the stock settings I tried changing the nozzle and nothing changed, so I’m guessing the problem is going to be related with the extruder itself