Smaller Cap

Found a 10nF cap on an old ComputerEyesRT board (circa 1991). No idea why I still had one lying around. Swapped out the 50nF cap. Adjusted the extruder capacitor setting to 0.00000001. Note: I've got two leads on the holes for C3 and have been trying out caps by soldering to the leads. Less wear on the board from soldering and desoldering.

Re-ran the profiler. Fewer I/O timeouts and false readings. Still noticing a change in duty cycle on the heater but it's less pronounced.

I haven't looked at any of the PIC code but I'm guessing the heater is controlled by a software PWM loop. If that's the case, temperature measurements and serial communication will mess with the duty cycle. Best you can do is avoid polling too often.