Update of the MMU2 firmware for ramps from : https://github.com/cskozlowski/mmu2/blob/master/doc/BOM.md
Project on https://www.thingiverse.com/thing:3910546
Now work with :
- MMU2S
- SKR mini or GT2560 board
TODO :
- describe new feature
- Wire schematic
- Marlin 2.0 configuration
- howto compile / use it