Accurate dispensing of two-part materials from twin-pack dual component cartridges has always been a problem where small shots of material are required. The I&J123-DMIX mechanical dispense system can dispense from 200, 400, and 600 ml cartridges with ratios of 1:1, 2:1, and 10:1. In addition, any ratio can be programmed into a 1:1 twin-pack or two 6 oz. SEMCO® type cartridges. It is now possible to program a 50:1 ratio using standard packages. This flexibility is achieved by two on-board computers driving two independent stepping motor rams that attach to the barrier pistons in the cartridge and are able to grip and pull back to prevent drooling of material.