This is an alternate back for the Raspberry Pi 7 Inch Touchscreen display case by luc_e. This alternate back allowed me to mount my Raspberry PI with 7-Inch Touchscreen to the top rail of my Creality CR-10 3D printer.
Just replace the rear cover with this one instead. I would imagine that this could be mounted to any 3D printer rail.
I did have to have longer screws to put it together.
I printed this vertical just as it will sit when being used. This printed the least amount of supports.