Hi there! I designed this bracket for the Open Benchtable. This bracket holds 4 small voltage meters. It is held on by one of the fan/AIO brackets and is braced on the back. I did include screw holes for the dmm screws if you so choose to use them.
This should be able to be printed without supports and should be able to be printed flat on the face. Also, you might be able to use the included screws to attach this bracket to the OBT.
I got the OBT source files from here: https://openbenchtable.com/community/