using '' keys for Mac to contract/expand selection.applying Offset to a mesh with boundary.
Please add your comments about how the crash happened. A report can now be sent to Autodesk when Meshmixer crashes, which will allow us to debug your issues in a more meaningful way.
You can now easily add custom printers and use your printer software to do the actual print, or you can export your model as STL and send it to the 3rd party printing services. We have eliminated 3rd party printing services that were not working properly and causing crashes. 3MF is an XML-based data format - human-readable compressed XML - that includes definitions for data related to 3D manufacturing, including third-party extensibility for custom data.