My Xiaomi lamp has a large button that broke in half. After failing to repair the original, I went ahead and 3D modelled a replacement, based on the measurements from the original.

For convenience I used Tinkercad to model it, so the polygon resolution is a bit boxy (which IMHO gives a cool look anyway). I also feel like the button has an almost unnoticeable spherical shape at the top, which I've omitted to simplify printing.

I will soon test print it and I might adjust it afterwards.