Based on the Frame-Brace by "markab"
I widened the holes, so 10mm inner and 30mm outer Diameter washers will fit.
Also narrowed the distance between both sides to 6,2mm - should give perfect fit for 6mm single-frame Aluminum Prusa Frame.
Another i slightly modified are the tabs which transfer forces and reinforce the angled parts. Made them both wider and a little flatter, so whole part should be even more rigid.
hope you enjoy it!
completely redrew the part in sketchup (what a PITA)
but I guess for what I wanted it was neccessary.
( I am no good at Blender, so editing the stl was not an option)