About this 3D model

UP 3D printer extruder mod and stepper motor shroud. spring is the same one used in the replicator mod..also you will need one shoulder bolt McMaster Carr 90278A312 one 626-2RS bearing http://www.ebay.com/itm/130848194394?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 I have quite a few rolls of "CRAPPY" filament that would not extrude.....they do now!!!!! Also, the shroud should keep your extruder stepper motor cool...mine runs at about 100 fahrenheiht. the fan is a 40mm 12 volt Jameco part number 212717 but any 40mm 12 fan will work.