Hey Max,

it turns out it's not optimal to work with the multi-line-edges since they tend to create subtle wobbling and smoothing in places where you don't want them.
I can't use an OBJ mesh where the parallel edge-lines coincide completely (for a maximum sharpened edge), I guess the obj importer or MoI merges those away? But even with very small distance values, the Subdiv Script fails (no error message, it just doesn't do anything).
The smallest I seem to be able to go is 0.05 mm which still creates too much smoothness for some of my edges.

So I still would very much love to have a way to set completely sharp corners :-)

Thanks a lot,

Tom