TPU-90A not working

Bambu Lab P1 Series Troubleshooting
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Two Pac-Man ghost models using 0.6m nozzle.

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I have only just started testing with my TPU90A and TPU85A filaments.

I tried TPU90A with the 0.4mm and the TPU85A with the 0.6 nozzle, both failed miserably with significant underextrusion and then printed in the air.

I believe I know what I failed to do with the TPU85A and will perform those tests again.

The 0.4mm/TPU90A tests will have to start again.

It appeared as if the filament couldn’t push through the nozzle or be dragged by the gears. It may be positioning relative to the height of the nozzle.

I am having fun with the 0.6mm/TPU90A combination.

I wish to print a pair of shoes from the CloudBerry account. They recommend the 0.4mm/TPU90A combination, so I will progress with that in the coming days.

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I have previously tried the 85A procedure. I even printed the mount they show and link to hold the spool.

Calipers show a diameter of about 1.70 which could be a result of the squishing. Seems fine.

I have not been opening the top and the door. I will do so for future testing.

1 Like
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I have the same goal of making CloudBerry account shoes. I could invest in a 0.6mm nozzle, but CloudBerry’s recipe calls for 0.4mm hence all this headache trying to get it to work.

Please keep me updated on your findings and what works for you when it comes to TPU-90A with 0.4mm nozzle.

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Will do.

The procedure for 85A says you must remove the lid to push the filament through into the head without using any PTFE.

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This can be very important. Personally, I never open the doors and top on the P1S unless I have this type of problem. TPU is the only filament I have ever needed to open it up for, and that’s only sometimes. It normally works OK without opening, but when ambient temps go up, it makes a difference. Give that a try.

BTW, that would fit the signs you have where some portions of the print look good, and then look very clogged (from heat creep), seemingly for no reason.

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As a kind-of summary for future people with this issue:

(Assuming already following steps for TPU-90/85A)
-Open door and open/remove top.
-Lower max volumetric flow rate.
-I found turning the build plate down to 25-30 after the first couple layers will also help reduce heat.

This is working thus far, will update when finished.

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I think these are both dumb.

Not you suggesting these to get it to work.

But there is a need to change something that BL sets in the profile for the filament they sell.

The filament profile should be designed for printing filament without further changes.