I’ve implemented the upgraded pulleys, but that got me to wondering. Your store shows this belt: http://www.lulzbot.com/?q=products/gt2-1164mm-6mm-belt as a “major upgrade to the T5 belt”. So my question is, what kind of belts would an AO-100 have shipped with, and would those be upgrades?
If you have a look at the AO-100 Bill of material here, you’ll see the belt used was GT2.
The Lulzbot store sells components to be used in any printer (non Lulzbot ones included). From what I can understand, T5 belts were popular for a time with RepRaps. Now it’s either GT2 or T2.5.