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 test the motors without my machine (disassambled). G-Code: M3 G21 (All units in mm) G00 X25.000000 G00 Y25.000000 G00 Z25.000000 G00 X0.000000 G00 Y0.000000 G00 Z0.000000 G00 X25.000000 Y25.000000 G00 X0.000000 Y0.000000 The last two lines cause the Z axis to turn fast and followed by vibration and then turn again. I already double (tripple) checked all connections. I dont have a clue, since the first lines turn the expected motors only. I hope someone has an idea. If further informations are needed i will try to hand them in later (like grbl config -> defaults) thanks in advance thuni Edit: I forgot to mention the software... Grbl version is 0.9j and I am working with UniversalGCodeSender v1.0.9. I also tested bCNC with the same results.