UP Afinia EXTRUDER MODIFICATION

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.