Fan snap ring

This is just a snap ring (i know i called it two different things so far, but i don't really know what to call this) that goes on the axle of the fan, and is absurdly easy to lose, and very annoying in general. Do to the ease in which it can get lost, i won't be able to upload a pic unless i find one, or i need to repair my fan. Here's hoping that i just find one... although i suppose i could print another one too....