How to crop a 3D model afterwards - Adobe Substance 3d Sampler

Hello everyone,

a quick question, is it possible to crop a 3D model afterwards? Probably too little exposure in the studio has resulted in excess material that needs to be removed.

As a note, I have already made smaller models (vases) and never had a problem. Now with larger (more complicated) pieces the programme has some problems.

I have inserted a screenshot, there is something at the bottom that needs to be removed.

I would be happy if someone has a solution.

Luca