Light duty shelf bracket

thingiverse

It's exactly what it claims to be. The weight is a mystery, but the feel is reassuringly solid, even if that doesn't mean much. The design was deliberately crafted to eliminate the need for supports. A stiffening web runs along one side, allowing you to lay that side flat against the print bed. Printing two of either model would work perfectly fine, but if symmetry matters, it's worth printing both files.