Wall surface looks weird

[Ghadeer 0]

Hello fellow makers

 

I was printing with TPU 95A the other day, and the print surface looked non-smooth with a bit of gaps between wall layers (see pic below). I used the built-in settings for TPU in Cura but I made few changes: 

 

Layer height: 0.15 mm

Wall line count: 1mm

Infill density: 10%

Retraction minimum travel: 0.7 mm

Print speed: 40 mm/s

Layer adhesion: Brim

 

Did anyone face this issue as well? what do you think the reason could be?