Customizable C-Clip - Updated

I try to design from a purist standpoint, with as little glue and non-printed parts as possible. So I try to print snap-fit parts, which works fine if you can print your flexible parts horizontally. But when it comes to round pegs, it is difficult to print the notched snap-fit pegs you find in commercial projects. When printed, the flexible tabs tend to snap along the layer lines instead of flexing properly.

So, my designs, such as the modified prankapult, have been incorporating c-clips.