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GRBL mystical z axis movement while moving x + y axis together

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Hello everyone,

I am facing a strange problem on my DIY CNC project. I can move every axis one by one, without any unexpected bahaviour, but when I move the x axis and y axis at once, my z axis is moving too. I can not figure out why.
Some lines about my setup. I am using an Arduino Uno together with 2 Big Easy drivers (for x + y) and a smaler Easy driver for z axis. Motors are standard Nema 23 and Nema 17. I wrote a little G-Code for testpurpose only and this behaviour occures even when I...

GRBL mystical z axis movement while moving x + y axis together

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