Wanhao Duplicator i3 V2 - Grounding Upgrade

My 3D printer was showing a +/- 10 degree swing in hotend temperature around the 245 C mark. I read up on the Wanhao Google Group and found an interesting thread that attributed the issue to improper grounding of the sensors on the Melzi board.

I created the video below while I was doing the upgrade for others to follow.



An important step I left out of the video was to switch to PID mode and do a PID tuning after this step.



Connections are as follows:
ETEMP GND to power supply GND
HOTBED to power supply GND
Processor capacitor to power supply GND

Disclaimer and warning: Follow these directions at your own risk. No guarantee to fix your problems and you may destroy your printer or yourself. Disconnect the unit from mains power before doing any work.

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