The invention described herein includes an interchangeable mixing system having a universal hub configured to rotate along an approximately vertical X axis. The universal hub of the invention may further include opposing flanges for individually mounting and removing one or more mixing cup limbs adapted to secure a mixing cup. A mixing drive can be adapted to rotate the mixing cup limb, and preferably counter-rotate the cup limbs along an asymmetrical axis (Y). In preferred embodiments, the mixing drive can be adapted to rotate the universal hub and one or more mixing cup limb through a belt-drive assembly.