Hi Randy,

> Does STEP format support this?

The STEP format itself has some support for colors, but unfortunately the STEP import library that MoI uses does not currently know how to read them in yet.

I think this is something that will be able to be fixed up in the future. For now you could try using some other CAD program to go from STEP to 3DM format, like for example if you load the STEP file into Rhino and save out from Rhino as 3DM, then load the 3DM into MoI may be a way to get the colors preserved.

- Michael