I might be able to design an "upgrade shield" something you plug into the board instead of the Arduino and then you can plug the Beaglebone into that. Which would be cheaper then a full board replacement.
Electrical wise I can make it work. How much components will be needed depends on the temperature sensor, and if it will work on 3.3V.
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coofercat 3
This sounds amazing - but it sounds like it'll end up being a complete electronics replacement for the Ultimaker (although you'll be able to reuse elements of the design). Uploading your design to the printer and letting it print is much more the way packaged printers work, and would (IMHO) be a significant selling point for the Ultimaker if it could do it. If you do end up redesigning boards and the like, how about adding in some sort of "expansion port" that hackers could attach devices to (stuff like LCD displays, control buttons or whatever) - it sounds like you'd have enough power available to be able to handle the gcode and some out of band communications like that sort of thing.
Either way, this sounds like a great idea - although could take some time to do, I guess. Good luck!
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