I have read a few times1 that the Arduino Mega can struggle to perform the tasks required for 3D printer control, as the AVR chip is working at its limits, and this is why some manufacturers have moved away from the ATmega2560, to make custom (and integrated) controller boards using ARM processors.
Having just seen the latest answer to this question, Multithreading with the Arduino, on the Arduino SE site, I wondered if anyone had used a Shield Buddy in conjunction with the standard RAMPS 1.4 board?
It is pin for pin compatible with the Arduino Mega (and Arduino IDE compatible - once the appropriate add-ons have been installed), but it has a much faster three core processor. Obviously only one core would be used, leaving the other two idling, but even so the performance is apparently much better.
If anyone has experience of using this board, I would like to know whether it was successful or not? I don't see why it should not, although the Marlin firmware would need recompiling, for the Aurix TC275 processor. Would any improvement be seen? Is it worth paying the high price tag of £89?
1 One of the places was 3D Printering: Electronics boards:
While they work for what they’re intended to do, there are a few limitations. Arcs and circles are a little weird to program, and using these boards for something other than a cartesian 3D printer – a CNC machine, or a laser cutter, for example – is a bit out of the ordinary.