UPDATE: Uploaded new files with slight adjustments, The profile on the back now has a slightly better fit, the lid is a little more snug, and I added taller pins for the Pi corner holes, and also a tiny lock ring to push down over those pins to keep the Pi in place a little better - just print four of those. 

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I recently started running my 3D printer with SimplyPrint - a danish implementation of OctoPrint which I find to be highly user-friendly. It runs off a Rasperry Pi, and works just fine with a Pi Zero, so I went for that, which makes for a nicely compact setup. 

I didn't want it just lying around, though, so I made a case for it - and I also wanted to be able to switch it off without pulling the power chord, so I added a switch. My own version is printed in transparent filament, making the Pi diode clearly visible, which I like! 

The switch is just a momentary normally-open pushbutton - for how to add it I followed this guide. I swear it's easy; never did anything like this before and it basically worked first try :) 

As you can see it can be mounted on those 2020/2040/4040 extruded alu profiles which I believe is used in many printers (mine is a Creality Ender 3 V2), you just need a single T-nut and a short M4 screw. The profile on the back of the case just has to be glued in the hole; I did it like that to allow for printing the body of the case flat on its back. I printed mine with a layer thickness of 1.6mm.