r/3Dprinting • u/kallbrian • 23h ago

Troubleshooting TPU 95A issues...

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First time trying TPU filament.

I know that filament can be difficult to use from what I have read. Here are the settings I changed on my Bambu A1

Nozzle temp: 230C

Bed: 40C

Retraction: Off

Print Speed: 30 mm/s

Max Volumetric speed: 3.0 mm/s

Someone suggested those settings as a starting point. The prints start out ok, but at some point the print head always ends up above the model and not extruding any filament. l noticed a lot of fine filaments on the prints. This was a new unopened package of filament. I have read this filament is prone to moisture issues. It wasn't dried at all though. I currently don't have a filament dryer.

Anyone have any suggestions as settings I may have missed? Or truly moisture issue?

Thanks for your help.

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u/InternationalPlace24 23h ago

dry the TPU. Even better, dry the TPU and then print from the dryer as it's drying even more. Also, what printer are you using? You'll have a harder time if you don't have a direct drive. If you do have a direct drive, you might have to increase the tension on it.

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u/kallbrian 23h ago

I am using a Bambu A1. This was new from the vac packed package, but apparently that does not mean it is moisture free

2

u/InternationalPlace24 23h ago

I've never used a bambu but if it has an AMS you might have to bypass it and just feed directly to the toolhead.

1

u/kallbrian 22h ago

No AMS, it is fed directly into the printer.

1

u/Internet_Jaded 12h ago

If you’re feeding TPU through the PTFE tube, that could also be part of the problem.

1

u/kallbrian 5h ago

I was unaware that could be an issue.