Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1785843.
This are mounting adapters for the E3D BigBox to mount a Duet Wifi board (https://www.duet3d.com/). You can also use them as a drill guide if you want to mount the board directly to the case.
The adapters are designed to fit the mounting holes for the default RUMBA board on the bottom of the BigBox.
To mount the Duet Wifi you need four metal hex nuts normally used to mount computer motherboards in their case and four 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/32ef367a7302e29f1ee736d3)