A simple parametric hook for screwing onto wall, designed for easy, no support printing. I recommend extra perimeters, especially if you are putting something heavier on it. It is fully parametric for height, thickness, length, screw size, etc (see screenshot with all the parameters available). Fusion 360 file attached - if you don't have Fusion and want a model with different size/parameters, just let me know the values you want changed from that Fusion 360 screenshot with the parameters on it and I will make an STL for you and post here