What's wrong with this print?

I am sure it is the filament as different color TPU from the same vendor, same brand etc. is printing fine. I dried the filament for an hour before printing. Any suggestions? Thank you

It looks like you’re under-extruding your material. You can try increasing your flow (extruder multiplier). I’m running a TPU and had the flow too high which caused too much back pressure and clogged. TPU has a balance of print speed and flow rate.

How fast are you printing? Might need to go slower, this happens on the ultimaker all the time if we’re going too fast with ninjaflex.

Also, you might need to swap the nozzle, or at least clean the whole extruder real good