This saves money for people willing to set up the mill with their own top and base. It fits in luggage pretty easily. Foreign shipping tends to be less without the extras, too.
Its crush promotes efficient winnowing. The particles are kept larger in the process of separating the nibs from the shell, which helps to reduce winnowing losses to levels below 10 percent by weight.
Initially, the upper gap lightly cracks the whole cacao along the natural lines present in the bean.
Then the central chamber between the three rollers tumbles the pieces, loosening the husks from the nibs.
Recommended speed is about 50 rpms. It crushes about 4 pounds per minute.
Or there's the heavy duty mill for the active chocolate shop:
Adjustable Cocoa Mill
In case you expect to be real busy at it, here is the link to:
The Large Cocoa Mill.