error using v_hacd : createCollisionShape failed

[francogassibe]

Hi there, i use the v-hacd tool and in general i have no problems, but recently i had problems with some meshes. Do someone know what requirements does my mesh needs to have? Im thinking about things like:

• if its a closed mesh
• the size of the mesh (if its too heavy)
• connectivity

The error i get is just "b3Printf: Request createCollisionShape failed"

My .stl files come from a Solid Works assembled project so i think that there might be some screws or litle parts inside my main part that may cause problems.

Here is one of my STLs my_piece.zip Thank you in advance