Minimal Shelf Bracket

thingiverse

I built these as a challenge to see how compact I could make a bracket while still being sturdy enough for a heavy-duty shelf. Since I'm unsure of the actual breaking point, I put 15KGs on a 122cm x 20cm pine shelf with two brackets for several days and detected no signs of stress. Essentially, considering their size, these brackets are extremely robust, but maybe don't load them up with 30 rolls of filament. The primary single-wall hole is 4mm in diameter. The three holes into the shelf measure 3mm across.