109JB, thank you for such an instructional response. Most helpful. I am almost certain I am going to take the risk and try the TB6600 on the plasma build.

Jfong, thank you for sharing your test results. I had considered these 2.4mH steppers. They are about $89 for 3 delivered. I had hoped the 3.5mH versions (3 for $65) would have been good to go; however, with all your testing, you make a good case for lower inductance versions. I will do some hunting on ebay, etc.. to see if I can find some lower inductance versions..

You have to love the information sharing the internet has provided and generous people like yourselves have contributed to.

-Mike