I wanted an upright stand for my MacBook as it was too low on a desk, and took up too much space. I've designed this so the macbook is at a 45 degree angle. As I also use my iPad as an additional monitor, and the keyboard is barely used, this also gave me an opportunity to create some space saving.

This is a quick print as the stands are hollow, but they're still very sturdy.

Also tested with a smaller 13" MacBook, and works just as well.