I have been using John U's case for about 3 years, and when it came time to mount a PI to the side of my printer, I figured out a remix of it would be perfect, as it is very thin and looks great! ..the only thing missing? Honeycombs.
Here is my take on a mountable PI 4B case. You can use this system to mount it on the side of your printer, or just use the Nonmountable version.
WARNING: Some heatsinks may be incompatible with this case. Make sure yours is small enough to fit as there is no clearance for it. I personally use a 5mm tall one.
The author remixed this model.