Short description of 3DM Import for AutoCAD 1.0: 3DM Import for AutoCAD is a Rhinoceros® 3DM file import plug-in for AutoCAD®. This plug-in gives AutoCAD the ability to import geometric data from 3DM files. 3DM Import for AutoCAD offers seamless conversion of 3DM geometry to AutoCAD's DWG geometry. The integrity of layers, blocks, block instances or inserts, dimensions, etc. are maintained across the conversion.