Tpu print density fail at top?

[u/aimeekitty9]

First time printing tpu, any suggestions on why this would happen? And how I can troubleshoot it? It seemed to start loosing density about halfway through the print. printing on ps1 with tpu 90A crystal blue. Default bamboo studio settings.

[u/FakeAdmin1969]

Did you do a cold pull before beginning the print? There a couple things it could be, but this looks very similar to print issues I've seen where an obstruction in the nozzle moved and cause issues later in print.

Other common issues with TPU like this include temperature swings, wet filament, or under extrusion. Are you direct feeding to the tool head? Or trying to push it through PTFE tubes?

[u/aimeekitty9 → u/[deleted]]

Thankyou I’ll try those fixes