A data communication network includes a plurality of primary virtual bridges, interconnected by primary virtual connections so as to transmit and receive data packets over the network to and from edge devices connected thereto. The apparatus is configured to format print data to pixel data, the pixel data including pixel values; identify a grid of pixels having a predetermined pattern of pixel values; obtain predetermined pcode grid from memory for the identified grid of pixels; and send the predetermined pcode grid to controller circuit for printing. An abutment member having an elastic membrane is attached to a lower surface of the vertically movable member. Moreover, the methods and compositions of the invention can be used in conjunction with essentially any surgical procedure used to treat an articular injury. The actuator ink chamber systems and ink jet print heads having an ink chamber with a low-adhesion coating applied on at least one portion of the inner surface of the ink chamber to reduce or eliminate actuator membrane damage during ink freezethaw cycles. The present invention utilizes mixing 50% to 80% of a base rubber material with zinc diacrylate and other materials, and later mixing the entirety of the base rubber material in order to prevent adhesion and loss of zinc diacrylate.