Hi Michael,
sorry for late reply (have new son and all).
Thanks for thorough analysis and detailed explanation. I appreciate that.

It is however quite time consuming.
I designed the model in a way that I don't join the parts as a model but export all parts as STL (making it sliceable and 3d printable as one piece)

And found out MoI3 cannot handle in timely manner those models.
MoI4 is much better in this application (and I believe in many others) :)

Juraj