Remix of Iakouben's Raspberry Pi Zero W case (https://www.thingiverse.com/thing:2349678) to suit the Ender 3.
I figured the rear of the machine was the best compromise as there was plenty of space and any cables would be out of the way of the Y axis rollers.
From my original print I enlarged the holes a little on the case, however you may need to grab a 3.5mm drill bit and clean them up. Otherwise the screws from the Ender 3 should just bite into the plastic.
35mm/s print speed (although you could go a bit higher), 2 walls/shells, ironing enabled.
Supports generated using CURA, placement everywhere, zig zag pattern @ 15% density.
Modified in Fusion 360 to match the screw spacing on the PSU bracket for the Ender 3.