maui
7
In some case the union may fails, so it is useful to make the operation before the exporting action…
I made some video tutorials for that (now a bit ‘old’), linked in the cheatsheet…
full demo howto
align 3d model to footprint
a User’s video tutorial
You may be interested also to:
and if you have some spare time to spend 
https://forum.kicad.info/search?q=stepup
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