I designed this mount to vertically attach a Raspberry Pi to my Ender 3 S1 to run octoprint on. It attaches on the bottom of the rail on the left side of the printer.
A 3d printable lug is included that has a cutout for a nut that you can insert into it. I designed it for some plastic ones that I had lying around, so it might not fit yours. I don't know what size they are
The author hasn't provided the model origin yet.