think of it this way. sugar is like a baseball (on the molecular scale). if you have a whole pile of them, there is really only one or two ways you can make a stack of them where they are stable. cocoa butter is shaped more like a the bat (baseball bat, not flying bat). it's long. it is not just a rod...
first part. the spectra , and all other like style models (granite rollers rotating on a granite base) are based off the indian wet grinder. that right there answers the question. it is for wet ingredients. to work, it needs a fluid to work with, be it water for rices and dals or oil for nut butter or cocoa...
references overview - bilfinger tebodin b.v. bilfinger tebodin b.v. en en home contact suppliers group english markets services company news careers menü menu home markets food, beverage & agro references overview ecom dutch cocoa expansion of cocoa processing facilities amsterdam, the netherlands read...