Start your CoreXZs!
Marlin has had CoreXY support for a while now, but for some reason CoreXZ has been waiting in the wings for a proper implementation. After a couple of days hacking and debugging I'm happy to report that CoreXZ support has been added to Marlin's Development branch, and according to testers it's working great.

If you've got a CoreXZ machine, please give the latest Marlin code a try and let me know how it's working for you!