Bowden Extruder - Geared Stepper

A bowden type extruder designed as a drop in replacement for airtrippers v3, but tailored to using a geared stepper motor. I specifically used the Phidgets 5.18:1 (http://www.phidgets.com/products.php?category=23&product_id=3317_1). The design is tricky because the motor screw mounts are significantly closer together. Works!