In the previous iteration of Cura, this was pretty straight forward. Home x/y, then z. adjust the screw for that corner, raise the print head up on the z axis, move to another corner using the controls, home z, repeat a bunch of times until it all seems pretty even, print the test to verify, and you're done.
Now, after getting Cura 3.6.3 and flashing the firmware on my Taz 5 (it wouldn't connect without doing so), I can do the first step, and adjust the one corner. However, when moving to another corner, hitting the home z button results in homing all 3 axis. Additionally, manually sending the "G28 Z" command in the console returns an error asking for x/y to be homed first.
If this were a Taz 6, with an automatic bed leveling, that would be one thing, but at this point I have no idea how to level the bed for a Taz 5 in this software. I tried digging through the online documentation but perhaps my google foo is failing me. If someone could point me in the right direction, I would greatly appreciate it.
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One of the safety features implemented in upstream marlin 1.1.9 is this feature. It requires the print head to be homed in X/Y when first powering on the printer. (Or after a firmware reset when flashing) Once it knows the "0" position, software endstops will prevent the tool head or bed from crashing into the frame. After you have homed X/Y, you will be able to just home Z in order to level your bed.