Funny thing at the opposite of Moi ;)
From:
Frenchy Pilou (PILOU)
7 Oct 2014 (39 of 3022)
4446.39
A Possible workaround :)
MagicaVoxel
Import inside Sketchup as OBJ or 3DS
Cleanup By Thomthom
Export as OBJ By TIG
_importObj By Max Smirnov inside MOi
Explode - Boolean Union
EDITED: 8 Oct 2014 by PILOU