Why are they cylindrical shape and not ball shape. Would that not be better for more random movement of the items inside and therefore be better for washing them?
In: 2
In order to realize the benefits of the ball (spherical) shape you would need to rotate about multiple axes. It is far easier/cheaper to build a motor that has a single axis of rotation. Extrude a 2D sphere (aka disk) along a single axis, and you get a cylinder.
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