About this 3D model

Remake to fit with Printrbots and Ubis hotends. All Printrbot Jr owners should use the base jr http://www.youtube.com/watch?v=Xb7hPECXst4 quick filament change http://www.youtube.com/watch?v=V1FkHT_6MmU Update 11/2013: added a baseversion with fanmount. Sometimes the filament got stuck in the lower basetube. With this 60mm fan I had no issues. download the counterclock version if your mk8 gear turns counterclockwise to extrude, otherwise download the clockwise version