I've always wondered what I should use the last bit of filament on a spool for, but then I came up with the solution: coasters! 

Please feel free to rate, comment etc. 

If you want any other designs or remixes please let me know :)

10 coasters should fit nicely in one holder.

PS: the hexagon coasters also fit in the round holder (but not the other way arround)

Coaster diameter: 9cm