I agree that the Duet would be even better if it supported dual extruders without the add-on board - I had to buy the add-on board just to support the second extruder and hot end.
I take your point about the USB interface being easier to configure then a web interface if you move your printer around, although you still need to have the correct USB drivers and control software on whatever PC or tablet you attach it to. However, most printers stay in the same place, or at least within range of the same wireless network; and the web interface is so much more functional than any USB control program I have seen, provides fast upload to the SD card, and needs only a browser on the PC.
I guess controlling the printer from a display provides ultimate portability, if you have ready-made gcode files on the SD card, I already have a full-graphics touchscreen display working with my Duet.
I take your point about the USB interface being easier to configure then a web interface if you move your printer around, although you still need to have the correct USB drivers and control software on whatever PC or tablet you attach it to. However, most printers stay in the same place, or at least within range of the same wireless network; and the web interface is so much more functional than any USB control program I have seen, provides fast upload to the SD card, and needs only a browser on the PC.
I guess controlling the printer from a display provides ultimate portability, if you have ready-made gcode files on the SD card, I already have a full-graphics touchscreen display working with my Duet.