Ah okay, then I got you wrong. I edited my last comment with a picture that shows the supports, so you get an idea where the „ugly“ parts would occur. I made good experiences with gas lighters (not normal ones, the ones which flames look a bit like a blowtorch). With these you can carefully warm the TPU and try to make the ugly parts a little more beautiful. You can as well use a clean soldering iron to iron the ugly parts a bit more flat.