The biggest changes that we’ve made to our AO-10x have been enclosing the whole fleet in acrylic for temperature stability (no more pink sheets!), and upgrading to the stabilized x-carriages on all machines.
If you haven’t switched yet, I highly recommend it; that change dropped our scrap rate by about 30%!
We’ve considered switching to TAZ style X-ends to clean up the sporadic z-wobble issues that pop up, but we’ve found that recalibrating the x-ends solves the problem just as well with way less down time.