This is a 90 degree angle joint for 1/2" threaded rod complete with a space to fit a nut and open-faced wrench. There are three 1/4" bolt mounting holes to attach plywood, sheet metal, or acrylic. This can be used to make many things and is easily scaled to other sizes. Can be used for framing projects, go-karts, wagons, suspension designs, and other arts/crafts.
Disclaimer: Use this design at your own risk. Load testing has not been performed.
The pictures are of the part printed at 50% scale. It fits 1/4" threaded rod perfectly. At this scale the mounting holes fit 6-32 bolts.