PLA, nozzle 0.5 mm, layer 0.2 mm
The thing was quite hard to assemble - the tube pieces needed a lot of sanding to push into each other and, most unluckily, the dust cap holder (where the rubbish goes out) was not printable at all due to the curved piece hanging in the air above the platform. I quickly fixed this by adding a ring around the bottom in 123D. Finally, the dust cap did not fit at all, but I found painter's tape a better and faster way to close the hole.
With my fan (specs unknown) it perfectly sucks in salt and small dust, but things like sesame seeds do not go up the input tube. Definitely, a powerful fan is needed here.
Thanks for the cool idea, Rom1mat!