I moved the button from the prusa mini to the housing of the 3d printer. I placed the button right below the light button. In order not to accidentally turn off the printer, I needed a button cover. I added places for screws to the cover from the original design, because I screw everything.

Dimensions inside the case: 18mm x 22.5mm x 8mm.

I printed without supports with a height of 0.1mm. It's hard to put the cover on the case, but it's doable and works great.