A1 TPU Failed print help

Bambu Lab A1 Series Troubleshooting
1

New to 3d printing Woke up to my first absolute mess of a print today!

Printer is an A1.

So I’ve been fine tuning my TPU over the last few days before I attempted this large print. Last benchys I printed turned out great.

Main settings I changed are below.

Nossel temp 215 (within the 195-230 recommended for tpu.
Flow rate to 1.3
Retraction off.
Aux fan to off.
Part fan 50 percent.

Here is the print. What are these lines? And for it to fail how it has obviously layer adhesion is an issue?

Same print also printed dowels and they just snapped in half straight away.

Please let me know if U need any further info.

Thanks

PXL_20250809_214145705.MP~2
PXL_20250809_214145705.MP~21920×2550 290 KB

PXL_20250809_213307639
PXL_20250809_2133076391920×2550 487 KB

2

Hi,
Which grade of TPU ? 95A ?
Did you use an AMS Lite ? Not recommended !
it is very important to have the filament path with as little friction as possible and for the filament spool to turn with as little friction as possible.
Generic setting is good enough to succeed.

3

from a local supplies called phaser in aus and its 95A.

i have the spool mounted ontop of my A1 in the standard configuration. is this good enough or is it better to mount the spool else where?

4

With a shaft with bearings it’s better: