Have you seen this..........

I was tinker with my printer, no power and no usb cable connected. When I moved the Carriage to the opposite side rather quickly. I noticed the backlight of my xxl screen glow. So I tried it again with both the X & Y it makes the screen glow. Can anyone else try this.

Seems like they act as a generator to light the screen no text just a soft blue light.

 

Yes, stepper motors can work as decent generators. I would avoid moving the carriage that fast just to make sure you are not putting reverse bias current on something on the Arduino enough to damage it.

 

Thanks I will stop just thought it was interesting.