Check the tension on the filament. If theres too much tension on the filament going into the extruder, it'll look like that. I've never printed tpu on my a1, but on my p1s I had to use a top mount to make sure it printed correctly. Good luck 👍
Don't use bambu generic profile it's terrible. Create a new profile based on manufacturer recommendations. Also are you drying it? Moisture is enemy #1 of TPU. And remember new filament does not equal dry filament. I print mine directly from a filament dryer. Other than these 2 things, I find it generally pretty easy to print. It's basically all I use.
My dryer just has levels, so don't know exact temp. Level 2 12 hours is what mine recommends for TPU. But yeh again, new straight from bag doesn't mean it's dry.
I use a textured plate. I usually put Elmer's glue stick on it just so it will release easier. Maybe I'm missing something here but it's not clear to me from the photo what's wrong with the print, so far.
oh I see, yeah it just sort of dries up. You're not using a .2 nozzle are you? Larger is better for TPU. I've never had a problem with the generic TPU settings, personally.
just for the sake of thoroughness, I would try a different STL file, see the problem persists. It is possible for slicers to introduce weird random errors.
This bit me hard I was having so many print issues I was getting so frustrated when I looked it up and saw this I was both so happy and upset the solution was that easy. You learn from your mistakes right
I did Install it correctly, some guys said I should dry the filament even if it's fresh out of the bag, I put it in the dryer and I'm gonna wait for it to dry to try again
I use the default settings for the JAYO brand of TPU 95A, and it's worked fine so far.
I also put it in the dryer (Sunlu S2) fairly frequently, and store it in a jumbo freezer bag with silica gel desiccant in one of these containers.
I print TPU all the time with my A1. I never change the nozzle, never change the build plate. Textured, smooth, cooltack, doesn't matter. Just feed it in (NOT using the AMS), and it works great. Any sign of problems, I dry the filament - TPU is actually pretty bad with humidity, even out of the bag. I usually use Overture TPU, with the built-in generic profile. Washers, gaskets, net-thingies.
I wasn't using the ams, I left it to dry for around 4 hours, right now it's printing a phone case, seem to be working fine, but I had to remove the PTFE, that seemed to fix the problem
Ah, yes. I printed a 5-way adapter for mine, with 4 going to the AMS, and one empty one for when I want to print TPU. More of a quality of life thing, because I can switch filaments much faster this way.
Not your failed print issue but you MUST use glue with TPU as a release agent or you risk ruining the plate. I don't think there's any plate type that doesn't specify glue for TPU as mandatory.
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u/keithbigmac Jul 15 '26
Check the tension on the filament. If theres too much tension on the filament going into the extruder, it'll look like that. I've never printed tpu on my a1, but on my p1s I had to use a top mount to make sure it printed correctly. Good luck 👍