P.S.... 3-4 years later, Sunday I started getting an odd "servo off line need to rehome" and new it was on my Z. It would only happen when the machine had been sitting for 15-20 minutes. Never happened working. Messaged SS and got immediate response. Crazy customer service. Some how, no idea how, air balance reg was low by 20psi. Ive checked the regs several times, never an issue. Turns out servo drive erroring out to too much current holding the Z up because of low pressure. 2-3 cranks on the reg and not happened since. SS's support for me at least has been phenomenal.