How to smooth the surface of tpu(flexible material)?

[shiling0613 0]

Hi,everyone...I used TPU filament to print out the product but the surface is very poor. The temperature set as standard which is 250 degree..Any methods can smooth the surface of product? Please help me solve the problem and give suggestion...

The picture below show my product.

 

Thanks 

Edited October 10, 2018 by shiling0613

[Brulti 177]

This looks like underextrusion. Did you select the right profile in Cura?

[Smithy 1,146]

I think 250° is too hot, because default UM TPU prints at 225°, so the bad surface could also be extrem stringing - on this photo I cannot see if the surface should be like this or should be a smooth.

 

And you should print TPU very slow to get good results.