This is a really simple design, but I hadn't seen this done before, so I thought I'd upload mine.
It's a small plastic divider insert that you can put into a miniature mint tin in order to turn it into a multi-day pill box. The OpenSCAD model is parametric, but the settings I have by default give you 6 compartments in an "Altoids Smalls" mint tin.
Update 1/22/2011: Added new files, a Version 2 (tighter fitting, notched) insert for Altoids Smalls tins and a new larger 15-compartment insert for full-size Altoids tins.
- Wash out your mint tin, unless you like minty pills
- Print it out
- Carefully bend the divider to get it past the thick ridge along the top of the mint tin
- Push it in. It should snap into place.