Taz 12mm X-Axis upgrade

Just finished installing 12mm rods on my Taz 5 X-Axis. I believe they are incorporating 12mm rods on the Taz 6 (although differently than I did it). The reason to increase to 12mm rods is to reduce the sag that occurs (worst at the center of X travel) as the extruder moves in X. The weight of the extruder and carriage causes the stock 10mm rods to deflect too much under the weight. The deflection is significant with respect to the tight tolerances required for nozzle to build bed distance. We ty