2020 Aluminum Extrusion Connectors

I Designed a clean 2020 extrusion connector that I used to build a CFS rack.  Could be used for other uses.  the connectors use the center threaded hole in 2020 extrusion.  I did not have threaded extrusion but was easily tapped for threads.  the design allows for hidden screws and a strong clean look.  I included a 3MF, if you want full CFS/AMS Rack print last 3 plates.  I also included  90 degree, 3 way and extension  separately. 

Thanks, also check out my other useful designs.