About this 3D model

This is a derivative of the excellent fan duct for Solidoodle by Ian Johnson & Lawsy (http://www.soliforum.com/topic/182/nozzle-fan-duct/ and http://www.thingiverse.com/thing:30828) It stays a bit higher up from the printing bed and has a notch to accommodate the longer screw in the back of the extruder