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Please see the current Duet3D documentation at https://docs.duet3d.com/
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Revision to Warnings

David Crocker

* '''Do not insert an SD extender cable into the built-in SD card socket!''' These cables frequently damage the contacts inside the SD card socket. Even when they don't, they do not work well at the high SD card transfer speeds used by the Duet.
* '''When mounting the Duet, if you use metal screws then make sure that they don't touch any of the electronic components or solder pads on the Duet!''' Use the Nylon washers supplied with your Duet under the screw heads.
-* '''Be very careful if you use a multimeter to measure voltages on the board!''' The probes may slip and short against each other or to other components. If you short the two pins of a fan connector together, you '''will''' damage your Duet.
+* '''Be very careful if you use a multimeter to measure voltages on the board, especially on the fan connectors!''' The probes may slip and short against each other or to other components. If you short the two pins of a fan connector together, you '''will''' damage your Duet.
* '''Do not rely solely on the Duet electronics and firmware to guard against excessive temperatures in your 3D printer!''' Despite the advanced protection features in Duet firmware, electronics and firmware can fail in unexpected ways. Read the Fire Safety page.
+* '''If you use a USB connection to the Duet, take care to mitigate the effect of ground loops!''' See [[USB ground loops]].

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