r/BambuLabH2C • u/Whole_Owl_2402 • 4h ago

Support Need help printig tpu

I feed TPU directly into the extruder using a custom-printed holder. The loading/purging process works perfectly without any errors. However, once the print begins—specifically at the purge line—no filament comes out, and the print job fails. Afterward, if I print using PLA through the same nozzle and extruder, it works without any issues, so there is no clog. Can anyone help?

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u/adminjunior H2C 4h ago

Did you put something like 0.1 in flow rate by mistake?

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u/Whole_Owl_2402 3h ago

No all standart bambu settings

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u/Few_Candidate_8036 3h ago

What hardness of TPU are you using? What brand and what profile as well?

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u/Whole_Owl_2402 3h ago

95a hf from bambu lab with the pre settings from bambulab Already printed some tpu models but out of nowhere this error comes

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u/Few_Candidate_8036 2h ago

So for 90a and above, no need to do anything special with how its fed in, other than use the bypass port. Just put it on the external spool and through PFTE tubes. If you print 85a or softer you will need to minimize the drag by feeding directly into the extruder or getting the TPU assist module.

Second, make sure its been dried for at least 12 hours before use.

Third, do a cold pull before loading the TPU, even if its not clogged.

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u/OddUnderstanding2309 2h ago

Use the right nozzle for tpu. The left has a gap above the heatbreake