After fiddling with my MMU2 trying to dial in all the filaments without it taking 10 hours was tough. I made this file to quickly (less than an hour) to test first layers, purge block, color bleed and purging strategy.
I suggest - Slic3r 1.5 setting for the MMU2, and let her rip. This takes the whole bed.
For success of this I have used a direct through PTFE setup on the Hotend to eliminate grinding.
This has three different tests -
- is the one you see in the pic
- has 8 segments to play with different colors all the way across the bed
- same as #2 only 2mm thick to allow some infill.
Prusament PLA PETG ABS