Thanks for the kind words 
…We’re just getting started.
This is one of the areas that I’m excited to explore next. @dlang just made a pull request that offers an interesting possibility for making things more accurate by correcting for the impact of the arms going out from the machine parallel to the surface before the belt is able to angle down.
Another option that I am excited to explore is this one:
I am confident that we can keep improving the calibration process and further refine our measurement of exactly where the anchor points are. I need to integrate this change into the firmware and do some testing.
Unfortunately I am still in SF after Maker Faire so I won’t have access to a place to set up my machine and try it out until next week when I’m back in Seattle.