This is a powder dispenser my son printed up for me. The bottom half has a compartment filled with bb's so I can turn the knob without moving the dispenser. As you can see the tube is slightly angled and has an internal auger to move the powder downward. It is slick as a whistle to use. But I did lightly sand the two port holes so it would rotate smoothly. It took 1 hour make, used 48 grams of filament and material cost was $1.15