Additional functionality to allow for different cap colours based on object/material id would be so helpful for when you're slicing many objects at a time with a single slicer. Drop a multimap in there for cap colour and bam, done. As it is now, looks like you can only have a single cap colour for everything. Sure you can have many instances of a slicer to cut multiple objects to allow for multiple cap colours but that's very tedious when in theory you only need one.