Geeetech prusa i3 pro B quality issues

[organotis]

I did measure the Vref fort the A4988 made by Geeetech. The Vref must be within 0.8V-1.2V. In my case the Vref was 0.9V on all 4 stepper controllers. I did raise the voltage to 1V and try to print something someday this week.

[Roxy]

The Vref must be within 0.8V-1.2V. In my case the Vref was 0.9V on all 4 stepper controllers. I did raise the voltage to 1V and try to print something someday this week.

I pretty much have all of my stepper motor drivers putting out the max current. The stepper motors get hot enough it is uncomfortable to hold your hand on them for 30 seconds. But I have not killed a stepper motor yet doing that.