The Onefinity Buildbotics controller does not officially support 4th axis (rotary) but some clever users have made some aftermarket solutions.
A buildbotics controller cannot do 4th axis (rotary).
Don’t be fooled buy the front of their control box saying ‘4th axis controller’. It can do 4 different motors, however, that doesn’t mean rotary.
There are 4 axis on the controller, however, the onefinity uses all 4, 1 X, 1 Y1, 1 Y2, and 1 Z. There is not a 5th axis left for a rotary.