Rack & pinion for X-Axis

thingiverse

The x-axis belt replacement was necessary due to its imprecision. A more accurate option, rack and pinion, was installed. With a 1/16 microstepping, the stepper motor now achieves 19.2 steps per millimeter. The x-pololu potentiometer required slight adjustment, while a fan cools it down. A 608 ball bearing presses the rack against the pinion for better contact. Check out this working demo: http://www.youtube.com/watch?feature=player_embedded&v=RgG2ghtuO-c