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Rooski
hmm , does the smoothie board have any significantly better features than the duet ?
Although I am a fan of the Duet, I'll try to be honest. The following features of the Smoothie may be advantages to you:
* You can buy a Smoothieboard with support for 2 extruders. To support more than one extruder on the Duet, you need to buy the DuetX4 or the RepRapPro Duet shield (but then you get support for several more extruders).
* The SD card can be accessed as mass storage via the USB port. Useful if you connect your PC to the board via USB instead of Ethernet.
* Smoothieboard supports low-cost LCD/rotary encoder control panels.
* The Smoothie firmware already supports CoreXY kinematics. The Duet does not, but will have this soon.
I believe the Duet has the following advantages:
* The web interface is much better (actually, there are 2 different web interfaces now, take your pick).
* Precise calculation of step timings, both for acceleration/deceleration on all printers and for delta movements. Whether this improves print quality is debatable. Both Duet and Smoothie compute step timings much better than Marlin.
* Support for PanelDue, a 400x272 colour graphics touch screen controller. [Full disclosure: I designed this and commissioned its manufacture.]
* Fast upload of SD card files via the web interface, and full control of the SD card via FTP.
* Other firmware features, such as estimation of print completion time, near-instant pause/resume of printing, and pause/resume macros. [Smoothie fans, please correct me if Smoothieware has these too.]
So in summary, if you want to use 2 extruders (but no more), or you don't have a network and want to use USB as the primary means of communication with the PC, then the Smoothie probably wins (and you can get low-cost Smoothieware-compatible boards without the Ethernet port). If your primary means of control will be PC over Ethernet, or standalone using a control panel, then IMO Duet wins, at least until Smoothie firmware and web interface catch up.