This bracket brings two 2020 extrusions together at 60 degrees and has a clamp for a 16mm wire shelf post. I designed this for building some triangular printer stands, but I figured I'd share them on their own in case anyone might have a need for em! If you'd like to find more about the printer stand, you can find more about it here

The brackets and caps should print without supports (although depending on your machine's bridging, the caps may benefit from something. The clamp has ridges on top and bottom to engage with the spacing on the wire shelving posts to 'lock' into position. I printed mine at 0.48mm layers out of PETG and have been really happy with them thus far.