I needed a tiny spool to make a tiny model of my proposed multi matter setup, so here is a tiny spool. Because I suck at math, I decided it would be easiest to just measure everything in cms and then convert to mms, thus it is 1/10th size. 

I changed the filament for the first and last layers to give the effect of looking like there is filament on a spool. tri-extrusion filament made it so I could print 10 and put them on the shelves and it appeared that I had made a few different colors, but it was just the rotation of the item. The actual shelf design is not especially practical, but these were handy for figuring that out before I used actual material.