Parametric corner bracket with round countersunk holes
thingiverse
Corner bracket for screwing stuff together. Hope you find it useful. Simple design with openscad. Print and screw on. Thingiverse's scad render of this part is wrong. All sides are triangular, the bottom one isn't square. Also, check out my L-bracket on https://www.thingiverse.com/thing:2848333 Update 20/04/2018: I added the 30x5 corner bracket, this seems to be a decent size/thickness balance for various projects.
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