Extrusion frame corner and middle plates
thingiverse
Designed these for my Hevo build. They fit on 3030 aluminium extrusions, screw is M6. The slots on the back fit tightly on the extrusion's middle groove so you can place them all with the screws already in place, measure and adjust everything and then when you're happy with it just fasten the screws. The whiteness you see on the back is from Cura's ironing. I use it to make the plate's back as flat as possible.
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