About this 3D model

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