1in (25mm) square hanging peg
thingiverse
just a simple stick up peg I designed. base is 25mm x 25mm and the peg is about 15mm long. I printed at 100% in fill for strength but you can probably get away with 15% if you don't plan to have much weight on it. a 1in x 1in double sided mounting square was used to mount the peg to the wall. design can be scaled up to meet your needs.
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