I have finished building my 2 multi material rigs. One with a MMU2S and one with a Diamond Hot end. I have both printers working. The red printer with the MMU2S I have had printing without the MMU2S connected and calibrated it pretty well before connecting the MMU2S and adjusting the settings in marlin 2.0.5.3 for it. The black printer with the diamond hotend I have printing with whatever first color I use. I am all setup and ready to figure this out. Here is my current workbench configuration..