Mini Spool for small filament samples

I bought some 15 foot flexible filament samples from 3DPrintNY.com which are sold as loose filament coils in a bag. I wanted to be able to put them on a spool but didn't find anything that seemed right for my application so I created something inspired by jimustanguitar's mini spool for 50g samples.

I created this to be customizable to different sizes and for different hub diameters.