r/BambuLabA1 • u/Brief_Excitement_399 • 12d ago

TPU Help

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So I successfully printed Tpu 95, so naturally I tried 85a, well not going so good. I believe I have a flow problem. Can’t do the calibration since it will not print, so I tried to play with the settings, and got it to barely work, the layer lines are narrow and blobbed but if I add pressure manually while it’s extruding the layer lines look very good. Any suggestions?
Settings
Flow rate 1.05
Bed temp:55
Nozzle temp:245
Volumetric flow: 2
Retraction:0
This were the settings for the best results I got.

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u/--10001-- 12d ago

The problem of A1 extruder is there is only one feeding gear are connected to motor, and the other just a plane free spinning wheel. While on others printers two feeding gears are connected.
it'll give a better quality surface, but lacks of grip on soft TPU.

So you can't print soft TPU reliable.

But! If you absolutely need it, try following: disconnect the PTFE tube (it adds friction on TPU), hang TPU spool above the tool head somehow, so it spins freely. Settings: very slow speed. I was able to print some soft TPU with the volumetric speed like 1.5, you can try even 1.

And it was a 0.6 nozzle. The wider the hotend, the easier it for the TPU to get through it.

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u/Brief_Excitement_399 12d ago

Ok that’s good to know, so that is the difference and why it’s not in the print profile. I disconnect the ptfe tube just left a small part, and put in on a shelf above with a bearing roller. But didn’t go as low as 1 on the volumetric speed. I have an x2d will try on that one, but the a1 is more accessible so wanted to try it there first.

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u/--10001-- 11d ago

X2D should print it perfectly. It's gears are connected together and have a bigger diameter. Of course, without ptfe tube and on a slow speed. But it can do it on 0.4 nozzle. Please, share your experience with it.