Changes

You may be able to determine what is going wrong by running Slic3r independently. For every print, MatterControl generates a config.ini file that it provides to the Slic3r executable. This is in {{ic|~/.local/share/MatterControl/data/gcode/}}on Mac/Linux and {{ic|C:\Users\{user}\AppData\Local\MatterControl}} on Windows. Run Slic3rindependently, import this config file, and slice your STL. You will then be able to see if Slic3r gives any error messages. On Windows, the Slic3r executable provided with MatterControl is in {{ic|C:\Program Files (x86)\MatterControl\Slic3r\bin}}.