Stainless Steel Lead Screw, 12mm x 420mm for Taz 6 are standar ?
I want to make clone of taz 6 and now collect information
Here in a link to the page that has the bill of materials and other documentation on the Taz 6.
And our Open Hardware Assembly Instructions for building the Taz 6: https://ohai.lulzbot.com/group/taz-6/
These should give you a good jumping off point!