Pill bottle cap covers

thingiverse

They work perfectly for keeping track of and sorting pills by the bottle. With this setup, groups of bottles become easily distinguishable, as well as the order they arrived in. The fact that they use covers instead of replacement caps allows them to simply slide the caps from one bottle to the next as they go through them. You can print these covers in different colors to group together distinct sets of bottles. Some people also add a small disc inside for an extra boost in making numbers more legible on each stencil. They come pre-made and ready for adjustment - you may need to tweak their size, but this should be all the info you need to get started with using them effectively.