I remixed the design to reduce the amount of plastic required. It's just a basic temporary mount for the Duet Wifi electronics board. Provides ample space behind the board for airflow, and if mounted with the board vertically, should not require a fan.
Screw holes for the board will likely need to be tapped with an M3 tap or drilled out with a 3/32 bit to accept an M3 8mm bolt. Test first.
The M5 holes for mounting to the extrusion will likely need to be drilled out as well. 13/64th bit should do it. M5 8mm bolts worked for me to mount to the V slot 2020.