https://github.com/prusa3d/Slic3r/issues/265
https://github.com/prusa3d/Slic3r/issues/319
Based on the implementation by @lordofhyphens
19eea19d91
https://github.com/prusa3d/Slic3r/issues/265
https://github.com/prusa3d/Slic3r/issues/319
Based on the implementation by @lordofhyphens
19eea19d91