Convert STEP/IGES files to STL on Mac
We’ve added a translator on Workbench that allows users to download a CAD file in STEP, IGES and STL formats, regardless of the format it was uploaded in. This makes it easy to share models with partners who don’t use the same CAD system you do.
With just one click your supplier can download any of the neutral formats based on the original file you uploaded.
Answered with a tutorial: https://grabcad.com/tutorials/convert-step-iges-files-to-stl-on-mac