The printer ink thing is probably their #1 success story, although the non-DRM version is to build some patented shape and rely on patents for protection, which may also work. (IANAL though; I know you can do compatible designs in some cases, too).
This whole "DRM for 3d printing" thing is a red herring -- the real war was "DRM embedded in physical devices we purchase", like auto parts and ink, and that was fought and lost in the last decade.
This whole "DRM for 3d printing" thing is a red herring -- the real war was "DRM embedded in physical devices we purchase", like auto parts and ink, and that was fought and lost in the last decade.