Description (copied from

This is the latest PCB revision of the Duet 2 Ethernet, v1.04.

The Duet 2 Ethernet is an advanced 32 bit electronics board for the control of 3D printers and other CNC machines. It has the same features as the Duet 2 Wifi, other than providing ethernet connectivity rather than Wifi, a full feature description is available on our documentation, in summary:

  • Powerful 32 Bit Processor
  • Dedicated ethernet module.
  • Super quiet TMC2660 stepper drivers, up to 256 microstepping.
  • High speed SD card and support for a second SD external card if required.
  • Dual extruders on the main board, up to 5 more extruders on the expansion board.
  • High Power rating: Each stepper driver is capable of 2.8A motor current, currently limited in software to 2.4A. The bed heater channel is specifically designed for high current (18A).
  • Connect via PC, tablet or smartphone on the same network to the on board web interface.
  • Setup your printer and update the firmware through the web interface.
  • All common 3D printer geometries are supported
  • Expandable up to 7 extruders with Firmware support for mixing nozzles and remapping axes to use high power external drivers.
  • Support for the PanelDue: a full colour graphic touch screen.
  • Support for DC42’s IR Z probe and the Duet3D Smart Effector for delta printers.
  • Provided with Molex compatible plugs and crimps as well as ferrules for power and heater terminals.

The Duet 2 Ethernet can have Thermistors connected directly, alternatively we have two different temperature sensing daughterboards available:

We also supply genuine e3d PT100 and thermocouple sensors compatible with their range of hotends:


Replacement parts

Fan mosfet

If you short out a PWM fan, the fan driver mosfet will burn out. The replacement part number is PMV40UN2 or PMV40UN2R which is available from the usual electronic component distributors such as Farnell/Newark/element14, Digikey, Mouser and RS. You can also use type PMV20XNER or AO3400A which have a higher peak current rating. The component identifiers on the board are:

  • Fan 0 mosfet: TR5
  • Fan 1 mosfet: TR9
  • Fan 2 mosfet: TR1

To remove the old mosfet, you will need either a hot air desoldering tool with a small nozzle, or low melting point solder such as ChipQuik . If using hot air, use a shield made from e.g. corrugated cardboard covered with Kapton tape to shield connectors and other plastic components from the hot air. The new mosfet can be soldered in place using a fine-tipped soldering iron, or by putting a little no-clean flux on the pads, placing the new mosfet on top, and using hot air again. Hot air soldering/desoldering is easier if you heat the whole board to about 100-125C on an electric hotplate.

Heater MOSFETs

Note when removing any of the heater MOSFETs there is significant heat-sinking into the copper of the board. A combination of hot air rework, Chipquick, and a heated plate may be needed to remove one successfully.

  • Bed Heater
    • TR2: this is an IPD036N04LGBTMA1
  • E0, E1 Heaters
    • TR3, TR4: this is an AOD4184A (you an also use IPD036N04LGBTMA1)
  • The small green component bearing the letters 'bF' is the self-resetting fuse, and the component with stripes is the optional 10K resistor. A piece of Kapton tape was put on the board first to provide additional insulation.

Mini blade fuses

  • 1A mini auto blade fuse protecting the fan circuits when the fan voltage selection jumper is in the VIN position. You can increase the fuse rating to 2A or even 3A if your fans, air pumps etc. draw more than 1A in total.
  • 15A fuse for the bed heater circuit
  • 7.5A fuse for everything else

TFT panel backlight inverter IC

If the TFT panel of a non-integrated PanelDue assembly suddenly refuses to light up, chances are that the backlight inverter chip has failed. This is a 6-pin chip marked L6CE or L6EN or L6GE or similar (the Pin 1 marking bar can easily be mistaken for a letter I in front of the L). The part number is MP3202DJ. It is available from RS Components, Digikey and Mouser, and also on eBay and Ali Express.

Other things

(warning) Duet has no support for POE and will be fried if it get's connected to passive POE like Shanqiu Mini UPS FX5-48 / Vultec Continuity UPS30PW-DC has got.

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