Inkpen Tracker Bands

I'm always losing my ink pens at the office. I lay one down somewhere, and then I have nothing to write with the next time I need one. Where do they go? I needed a tracking device. I thought I'd use some NinjaFlex filament I bought from Maker Geeks http://www.makergeeks.com/ to band my pens so I could recognize them if I saw them again. Much as scientific researchers do to track animals in the wild.

I measured various writing utensils I had on my desk and used 123D Design to make flexible bands to fit them. If you need a size not listed, they can be scaled to fit in your slicer software.