These are brackets that you can screw to a wood board (like I did) or directly to a wall with standard drywall screws (3.5mm diameter).

The brackets are made for usage with round wooden sticks of 22mm diameter (french standard wood sticks).

I made them with 20/25% infill and 2 of them are strong enough to handle kite boards (~5kg). I suggest to increase wall layers (at least 4) !