The johann mini kossel version along with the other versions don't have servos and doing add too much weight. I originally wanted to use autocalibration because I felt that it would be a great way to get things calibrated for its first print, but the autocalibration is only effective if you have a good/nicely calibrated machine to begin with. Many have said that the autocalibration feature is not a substitute for first calibrating the machines towers and center. I have multiple all met hotends with different nozzles and heights that require me to change the z height, so in theory it might benefit me. I've got my machine tuned exactly the way that I want it to be, so I wouldn't like my parameters being changed every time I turn on the machine and run the G29 code. Although, there are many people who love the autocalibration feature, I guess it is really down preference.
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