Wanhao i3 PLUS restarts when connecting USB I just received my Wanhao Duplicator i3 PLUS. Everything prints and functions fine via SD card and the display but when connecting to my Mac computer the printer seems to restart.


Baud Rate: 115200
Serial Port: /dev/tty.wchusbserial1420


Any ideas what it could be?
I don't know that printer. But Arduino has a feature that a USB connection causes a reset. The Idea is that this helps when doing software update as the Arduino Boot loader will be active for one second after that reset.

This can be disabled, but needs hardware modification.