Because the Magic Keyboard is flat, I've drawn this riser for it. It is very light and discreet, easy to print (no supports required) and quick to (un)mount.

You can choose the version and height (for V2), V1 should also work with PLA, but I strongly recommend ABS for V2. The rubber feet should be in TPU / flexible filament, but you can also skip them. If you want them, a drop of glue could be a good idea.

V1 is made to be inserted from side, by slide both parts. V2 also could be installed like that, but is easy to clip directly otherwise.

Depending of your printer, settings and filament, you could have to scratch edges a bit for perfect fit. The first time you use a part, spend a little time to move it left-right, this will adjust finely the piece. Then, it's a pleasure to put as it stay in place and fit perfectly.

Edit: I've added a V3 version, because after months using V2, my piece begin to break. Maybe because I've put and removed again and again, especially at the beginning. So I'm trying to make it a bit stronger without being too big (I don't want to disturb my fingers...).