Made this for the Mrs after she saw a similar idea on Pinterest. I started with embeddedjunkie's model of the death star and modelled into the Yarn bowl with a base and cut out for the yarn to feed through, obviously this comes through the laser port.

I printed this without supports (clean up was needed!) with a colour change at the top of the base. Model still needs a bit of work to round over some sharp edges.

UPDATE: Many users have commented about the amount of clean up. If you are concerned, use supports!