Six Inch Shelf Bracket

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: