This is a smaller spool in 2 pieces which screw together. It is intended for winding your smaller quantities of filament, leftovers, etc. I am finding it quite useful for my filament samples from MakerBox as well as winding small quantity leftovers.
This is a very, very quick remix of the "small spool" thing created by tamel55. It's an awesome and handy design, but when I tried to slice it in Simplify3D or Cura, the threads on the male side of the spool came out with lots of holes in between the threads, almost like the wall behind them was made of mesh.
So I simply dragged the model into Tinkercad, "sleeved" the inner surface to thicken it by about 1mm all around, and it sliced fine after that. All credit for the elegant & handy design goes to tamel55.
Bi-color print was not planned. I just ran out of blue & grabbed a box labelled "purple." I guess a light magenta passes for purple in China. LOL