This is a clip on version of this this ( http://www.thingiverse.com/thing:433148 ). My machine runs way too hot on small layers so I made this to help without using tape to attach it to the front of the extruder. Good luck getting the support right, slic3r tries to add support to the little ducts. Cura getting it right with some setting changes but I can't get anything to print properly from Cura. I got it to slice right using Simply3d software and added the gcode file here for you to try.