Question TPU print extrusion issue after a few layers

[lord-carlos]

I print at 30mm/s with no retractions. The first few layers look decent, but later on you can see it's almost like it's getting clogged or can't extrude enough.
But only on one side, and after switching to the next layer it starts out great again.

It's a no name TPU. I think I run it at 220C, slightly above recommended from the packaging.

Spoiler: pictures

voron 2.4 with Afterburner and clockwork1

 

[claudermilk]

I'd try slowing down even more. TPU needs to be printed ridiculously slowly.

 

[lord-carlos]

Mhh, because the TPU was iffy through my reverse bowden I fed it through the front door. I think my trouble is that it could not extrude everytime the extruder went to the back, away from the spool. I'm going to tighten the extruder screw thingy, slow a bit more down and try to work on how I hook the spool up.

 

[lord-carlos]

It somehow got worse. I now limited it to 1.2 mm3/s

 

[lord-carlos]

Bought a fresh roll of TPC, a bit softer.
First simple test indicate it prints much much better. There must be something wrong with my old roll of TPU. Even though I dried it, I might have to dry it even more, or with more heat. Or maybe it's .. somehow "not good" any more?

 

[claudermilk]

I'd try drying it extra long as a first step. Some people call PETG the devil's filament, but it's just a pretender. TPU is the devil's filament.

 

[lord-carlos]

TPC is nice.
The corners lifted quite a lot, so I have to work on that though.
Currently doing an extra long drying of the TPU.