Ask HN: Version control solutions for 3D cad files

Hi all, I currently keep 3D part models and assemblies in svn for version control. This kinda works but one big drawback is I can’t readily see diffs between versions of the files. I’m typically using solid works or .stp files. Does anyone have any better solutions? I know GitHub can diff stl files. But those are not native to the 3D cad programs.