So... Need to repair one of the Lulzbots? Print new parts? The official starting point (as of 2016.01.19) appears to be:
However, some alternatives:
Extruder Head Idler
The extruder head idler parts for both the Taz and the Mini can be found at:
Lulzbot Mini front panel USB support bracket
The part currently on the Lulzbot Mini is from a source unknown. Although I have the file(s) I am trying to locate the source of said files.