IKEA Sibbhult - Wall shelf bracket
thingiverse
I was putting up some shelves in my bedroom and wanted to try a few different layouts and see how they would look, so I ended up drawing and modeling the brackets and shelves in Fusion360. I haven't actually printed one yet, since I just needed it for measuring. Should work just fine though. Since it is (most likely) designed for extrusion molding, the reinforcement walls would not be as strong when 3D-printed, so personally, I would probably use a full solid body and slice it with a cubic infill pattern.
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