Zmorph clip-on extruder (new version, September 2013)

http://www.youtube.com/watch?v=v-lorciobkc&feature=youtu.be

This extruder maximizes travel in X and Z axis, by positioning the motor in lowest possible position on the carriage. The motor is perpendicular to X axis, mounted by two screws tightening it from the top (none of four standard M3 screws are used).

The body is mounted on the carriage only with one screw, allowing very quick detachment/attachment (it's sort of clip-on really). It's also very rigid at the same time - no wobble even