Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1899633.
This is a mounting adapter for the E3D BigBox to mount a Duet Wifi and a Duex board (https://www.duet3d.com/). You can also use it as a drill guide if you want to mount the boards directly to the case.
The adapter is designed to fit the mounting holes for the default RUMBA board on the bottom of the BigBox.
To mount the Duet Wifi and the Duex you need eight metal hex nuts normally used to mount computer motherboards in their case and eight screws for them.
Nylon washers under the screws are recommended to prevent a shortcut! My Duet Wifi included some of those washers.
Desinged with Onshape (https://cad.onshape.com/documents/c5c1fd333b46af1490c4a1cc/w/1570f7e015d95b93847a9d1f/e/89b1ecafa0091d711d3bb5b5)