Here are a series of L-brackets we use to make 80/20 structures in our robot. Not only are these parts lighter, but we can also print them when we need them.
In our set we have brackets of different sizes, 2x2, 1x2, and 1x1.
The parts are considerably lighter than their aluminium counterparts, but are not as strong.
Keep it Awesome
Print part. The holes usually print fine, but they might need to be drilled to fit larger ( >1/4") screws.