Tried asking this in the open source controler section, never got an answer, but: Anyone used the Texas Instruments UC3770AN chip, what about the A3959SBT from Allegro?

I've got a A3959 design in works. Looks to be a great alternative to the expensive LMD18245's!

Do I need 1 chip per axis, or will 1 control all 3?

you need two chips per two phase stepper. It will be a one axis board, same as my others.

I got 6, so I should be good then.

Any progress on the A3959 boards?

Not really, when Allegro released the A3986, all my attention went to it. SInce the A3986 allows a higher current implementaion at probably less cost, It's more likely a better solution.

any developments on that? :)