I love USB keyboards and recently I switched from my 20 years old Apple Keyboard (A1048) to an Apple Keyboard with numeric keypad (A1243). This was the first “slim” keyboard from Apple with a numeric keypad. But because I can't type very well on such flat keyboards, I wanted to raise it higher at the back. So I designed and printed one or rather two small risers which, when clamped under the keyboard, raise the back by about 10 or 12 mm. I used TPU for printing, as TPU is more slip-resistant on the desk.