Reinforced Triple Extrusion Corner

I was building a frame for a project, and I decided that it would be much stronger if the corner brackets were all attached.
So I made this!

It's customizable for different size extrusions and different size screws. The STLs I posted are for 20mm extrusion, with M5 screws, since that's what I'm working with.

Also, I recently added a tee connector, since I had use for it in another project.

(Sorry, I didn't bother tapping the M5 screw all the way into the extrusion for the protytype in