This should work for any application needing to mount an extruder with the same pattern as the Smart Orbiter 3 to a 20X20mm bolt pattern MGN12 rail.
Belts wrap around the base plate and use clips or any other fastener to hold them.
It uses 97171A310 inserts from Mcmaster as I had them lying around so I cut them down flush after inserting. The flange is on the side facing the Orbiter on mine.
The screws are 90236A120 also from Mcmaster with 8 being used. Any M3 can be used on the outermost holes to screw into the brass fittings and I intend on mounting other attachments to those with longer screws.
The author marked this model as their own original creation.