Clean triple keyboards stand

I was inspired by this model from MakerWorld: https://makerworld.com/en/models/654625-quad-keyboard-stand. After printing Martin’s design, I realized that my shelf couldn’t accommodate the fourth keyboard of his stand. So, I decided to modify it to support only a triple keyboards. This also means that the printing time will be faster, and you'll save around 70-80 grams of filament.