Hi @mangelozzi
that should solve your issue
https://sourceforge.net/projects/kicadstepup/files/latest/download
kicad_StepUp_tools_v4025
please let me know if everything is fine now 
Maurice
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Hi Maui, I tried it out, and it works perfectly now! Very impressed, well done for fixing it! A generic block/cylinder is good enough for most MCAD review. Thank you so much!!
thank you for your bug reporting and feedback!
I fixed this also for some standard models case when using a different approach to the one I use/suggest in aligning models 
Here are two step files (I think step is prefered to wrl these days) I made in FreeCAD I use a lot for rough fitting a 3D model (each have dimenions of 1mm for easy scaling):
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