This is a simple keyboard riser, designed for Apple's Magic Keyboard. It's easy to print and has an inset for a 1/2" diameter no-slip silicone bumper pad. I used two-way sticker pads to adhere these to the back of the keyboard and insert the no-slip bumpers and it allows the Magic keyboard to be used more ergonomically.

These are the bumpers I use https://www.amazon.com/gp/product/B08BR6CGWL/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1