I'm trying the print again, .1 speed and 30% infil. Nozzle is 230C, printbed roomtemp. Slowing it down has seem to made it so much better. I think I was at .2 before or .15. Its not done yet, but it looks so much better, so maybe slow is the way to go with TPU. Note on the material. It's not very stretch, but its flexible. So like the ring shape, it flex's very little bit but you can "Crush" the material. Pulling the ring with a finger on each end, it doesn't get much bigger. So prints like this would have to be customized to a persons size.
Also don't mean to be hijacking your post, you inspired me to make some of this stuff
