I designed this hanger peg to hang things on the wall using the various 3M Command Strips which I'm a big fan off. I have a bunch of things that have those little "keyhole" hanger points that you're supposed to slip over a nail or screw head but I don't like making holes in my walls especially when the item doesn't weigh very much. So I made this design to attach to the wall with a Command Strip designed to hold the weight and then hang your item on the peg. You can also use them upside down as you can see in the picture.

The normal Poster strips are supposed to be able to hold up 0.5 pounds which is plenty for many small things. Need to hang something bigger like a drill battery holder? Scale up the base for a bigger Command Strip for more weight.

This STL has an 8mm "head" with a 4mm shaft. The head is 2mm thick and the shaft is 3mm tall. The rectangular base is 2mm thick, 15mm wide and 28mm long. That's the right base for the small/poster sized strips.

Let me know if you print it, upload a "made" picture, and if you had to modify the sizes for other "keyholes".