at the firmware. The M220 B / M220 R are only applied for MM prints
without any flex or soluble (PVA, BVOH) material, as for these materials
the MMU slows down the print using the M220 code.
fixes "LCD Speed Modifier Lost on Tool Change #421"
Changes in SupportMaterial.cpp, TriangleMesh.cpp and 01_trianglemesh.t
are yet to be merged.
WIP: Refactoring of layer height editing.
Removed layer_height_ranges from PrintObject, as the Print/PrintObject
now hold their copies of Model/ModelObject.
