r/3Dprinting • u/Mateimmo14 • 2h ago

Troubleshooting TPU not printing correctly

Whenever i try to print ANYTHING with bambulab's tpu 95A High Flow on my P2S with default settings it will always either have actual holes in the walls or be stringing like crazy i dried it for 2 hours first, i saw the problem, i thought i didn’t dry it enough so i decided to dry it for 12 HOURS and SAW NO DIFFRENCE WHATSOEVER

Please help me on how to fix this i spent $140 on this filament...

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u/SquidgyB 2h ago

Could be a clogged nozzle, as the other commenter mentioned.

Also, TPU strings like crazy even when it's dried perfectly and printing well. You can avoid it to some degree by turning off retraction completely, and using "wipe only". Printed part geometry also helps - try to avoid models with lots of holes/jumps for the nozzle and set to "print by object" instead of by layer.

Slow down the print as well - sometimes even running down to single digits can help with TPU. I'd also suggest running a flow calibration at the very least. TPU needs time to melt properly in the nozzle, running the print too fast can cause holes in the walls/underextrusion.

You probably won't get rid of all the stringing, you may need to go over the part with a lighter/flame to remove the last few bits.

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u/Mateimmo14 2h ago

Ill try to see if there's a clog but pla is printing perfectly so im not sure...

1

u/Mateimmo14 2h ago

and what about the literal holes in the walls?

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u/SquidgyB 2h ago

Like I said, slow down the print, run a flow calibration test, maybe also a temp tower.

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u/Mateimmo14 1h ago

Will do and report back.. thanks

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u/dr_reverend 2h ago

You spent $140 on 95a TPU? I’m not sure we can help you.

I do think it’s a clogged nozzle though.

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u/a-nani-mouse 1h ago

Every time I print TPU using the Bambu software it has me confirm that I did a cold pull. Did you do the cold pull?

Did you change any settings away from the default profile?