Slicer: change filament by layer#693

A feature I frequently use in OrcaSlicer is changing the filament at a particular layer. In the Preview section of OrcaSlicer, you can pull the vertical slider bar down and change filament, as well as pause. I don’t see this feature in the built-in slicer. You can select to pause, bunt not change filament. This is much easier for my students to use than trying to “paint” an object.