Revision to USB ground loops
|* Don't connect the printer to a PC via USB when you don't need to. The Duets all have Ethernet or WiFi connections, so USB is generally used only when debugging.|
|* Make '''very sure''' that the cable between the power supply and the negative VIN terminal on the Duet is rated adequately for the current and secure at both ends. Check that the VIN terminal block screws on the Duet remain tight.|
|* Pass the USB cable a few times through a ferrite ring, or use a USB cable that has a ferrite ring fitted already, or buy a split ferrite bead and clamp it over the lead. This mitigates the effect of ground transients.|
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