This is a lid with a coin slot to turn any wide or regular mouth canning/mason jar into a bank. The slot is designed for US coins, but you can tweak the slot dimensions in the scad file.

This can also be used with a canning jar as a sharps container for razor blades, and other sharps, in the shop or your bathroom.

This one was printed with ProtoParadigm's green PLA on a Makergear Mosaic.

See thingiverse.com/thing:19105 for the lid this was based on, and for links to more canning jar accessories.

This thing is a part of a collection of things featured in this post: protoparadigm.com/blog/2012/08/what-to-do-with-a-3d-printer-make-canning-jar-accessories/