This is designed for the dual MGN9 Gantry and does not support the single MGN12 version at this time.
BOM: https://docs.google.com/spreadsheets/d/11P4xNVWnaj5GTj4v-W7mCnUWaC7SpzQkzQRWBSeQ_3g/edit?usp=sharing
The author marked this model as their own original creation.