Not sure I'm ready for this - I've started building!

[harryn]

Hi, I don't know if they are the cheapest or best or anything, but if you want AT style pulleys, brecoflex has a lot of options. They do offer a high precision version as well, which they claim as being quite low for backlash.

The nice thing about AT style, is that you can get it with quite wide belts as well, so belt stretch can be reduced to a non -issue level.

The most expensive pulley quote I ever received from them was around $80 I think, but it was pretty specialized. You can also buy their pulley "blanks" already made - so they have the teeth, but not the rims. I have considered picking up some 150mm wide blanks and have them bored locally as needed. Then again, their concentricity specs really were pretty decent unless you find a very good shop.