Simple Shelf Bracket (many sizes)

By the past I bought that easy shelf brackets that hold a shelf by it's own weight. Unfortunately, I could not find it anymore in the neighbourhood. So I decided to make my own, and make it parametric, so I'm able to adapt it to any shelf thickness.

So if you like a custom bracket to match your board thickness, feel free to ask.

/!\ Please not that kind of brackets are not heavy duty. If you want to hold a heavy shelf, multiply the number of brackets. In the same way, use the proper screw according to the weight each should hold. If you're not confident, make some tests.