Hi, unfortunately .3ds is the only way i've found to import into archicad. The quality of the model is OK but I tend to use it as a place holder and replace it with a .obj version when i import the archicad model into C4D. There is a problem with MOI .3ds export in the fact that i cant get moi to export its styles in the .3ds format - certainly archicad cant read them and the objects come in in one material. Exporting from C4D to archicad with .3ds does allow multiple materials so im guessing they've not been enabled in the moi export.

cheers