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Hi, I built one but can't get the software to respond to any commands.

I have a bit of test code that will contol the stepper motors and servo (just moving them for a bit and then reversing direction) so I know everything works. It just seems like the Arduino is ignoring comms. I should be able to manually send Gcodes via the serial monitor right?

http://Feeder.pyFeeder.py gets stu
ck at 0.4%.

I'm using a revision 2 uno, would that have any relavance to the problem?