Parametric corner bracket with round countersunk holes
thingiverse
Corner Bracket for Easy Assembly. Hope you find it helpful! Simple design created with OpenSCAD. Just print and attach. Thingiverse's SCAD rendering of this part is flawed. All sides are triangular, while the bottom one isn't square as expected. Check out my L-bracket on Thingiverse: https://www.thingiverse.com/thing:2848333 Update 20/04/2018: I added a new 30x5 corner bracket, achieving a decent size/thickness balance suitable for various projects.
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