Hi Moritz,

> my MAC Pro 12-core runs out of memory if I try to export a 130 MB .step file into an
> .obj file (ca. 1.000.000 polys).
> Can I change some settings in MOI to solve this problem?

Check out here for some things you can do:
http://moi3d.com/forum/index.php?webtag=MOI&msg=5322.2

There are some settings you can adjust to reduce memory load and also if you export the file in a couple of pieces rather than all at once that can help a lot too.

- Michael