Already tired of sanding my fingers due to grinding parts and seeing that many models have been created but for my big hands they are a little “small” (and it's not that I have very big hands), I chose to create a sandpaper block that It was comfortable for my hand and it turned out that the size of my PC mouse is usually a very suitable size, I also noticed that the shape of the mice allows me depending on the case to use them in one direction or another of sanding so I got to it and This was the result that was most practical for me, the sandpapers hold well and just with a M6x20 (maybe a M6x15) hexagonal screw and its respective nut the entire clamping mechanism is solved.

With dimensions of 121x68x40 (42 with sandpaper), the sanding surface has a length ± 105mm x 68mm width.