You can find the model with description here - https://www.printables.com/model/1015615-3d-chameleon-adoptation-for-snapmaker-20-single-ex
I've added a different style of switch, using the roller-wheel switches that I had already:
https://cad.onshape.com/documents/fb7b8e8cd253dee8fe0b3e05/w/49694d5233130957590d1f8b/e/5d036e2f3051e63d08976ae1?renderMode=0&uiState=6781b7cbd7003409359689ae
https://www.printables.com/model/1143282-3dchameleon-mmu-switch-for-snapmaker-a350ta250-rol
Nice one, has it been working well? I see you're interested in adding the Auto Clippy, good work! I think I want to start with that option from the beginning as it's a significant improvement to the process.