geeetech persia x pro moving mid print with a grinding sound

[Greenhorn]

i have a x pro, and using pronterface and repeiter-host, with Slic3r, and no matter what on 1/2 my G-codes about layer 12-25 it will make a weird sound, then start printing 20 millimeters off on Y axis???????

[Mark]

I think your driver voltage is too low, you can increase it to check it, refer to the link here to change the voltage:
http://www.geeetech.com/forum/viewtopic ... 13&t=17038