Six Inch Shelf Bracket

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I needed simple shelf brackets to hold up shelves made of 2x8's. These are 150mm x 150mm x 15mm right angle brackets (close enough to my target of 6in ish). The four holes are 4mm on the sides that touch the wall and 7mm on the entry sides; this is to allow for my particular drill bit & screw combo. I printed in black Hatchbox PLA at 0.2mm layer height, 2 wall lines, 4 top/bottom layers, 20% infill (for testing purposes; I will likely go up to 50% to make these bulletproof later). Took 5 hours-ish to print with fairly slow print settings for nicer quality. I plan to use these "raw" and unfinished in any way other than cleaning any stringing or what-have-you. If I end up liking the design and it holds up well, I will dump more files including versions without screw holes, with screw holes, and the object(s) themselves in Tinkercad so the community can remix hole placement/size/etc. My original Cura settings for testing are included as screenshots. As a sidenote: I've found a "hack" for countersinking screws in a fairly structural way in 3D printed parts when using "countersink" or "bugle head" screws. I make the screw hole just large enough to fit the shank/threads through and then I use a cordless drill to spin the screw in place long enough for friction to melt the PLA and let it conform perfectly to the screw head. This takes seconds and in my testing has produced pretty solid results with no failures. I will say that I normally do this with fairly thick-walled prints so there's plenty of material to melt into place rather than just thinning the material out. UPDATE 1/27/2020: I like these, but ended up scaling them up by 2 or 3 percent to fit some other screws I was using. I'll dump the TinkerCAD model and instructions sometime this week when I get a chance.

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