OK forget about what I said! As soon as I touch/move a bit the wires on the controller side, the motor stops shaking!
I will do some updates to use a different port for this motor and see how it behaves!
Some RC servos can have issues like that mostly when it a position where the forces are too equals.
The motor will always have some backlash and the feedback might request a move, then itās over moving which then create an oscillation. Thatās partly the reason why there is a spring included but your particular position could be problematic.
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I moved the motor to #7 and itās now working perfectly. Itās working for about 2h without any shaking. I will keep it working for another 3 or 4 hours but it already looks way better! Not sure why 3 was doing this. But at least I can be back at sorting the cards and improving my ML models 
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It would be weird that this specific output is defective. (not impossible)
But maybe your code sometimes mix some #ID and it affect ID3 only ? The only way to find out would be to monitor that with a scope but thatās not for everyone.
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I went the dirty way
public void moveMotor(int motor, int pulse, int speed) throws IOException {
if (motor == 2) {
motor = 7;
}
send("#" + motor + "P" + pulse + " T" + speed + (char) 13);
positions[motor] = pulse;
}
So if something was messing up with the motor, it will still be messing up the same way as I have just hard-coded the move. And it was not always shaking. Iām wondering if by removing the wire and re-plugging it, I kind of cleaned up maybe? I donāt know. Or itās further from its interference?
Whatever it is, itās still working without an single issue! Did I already tell you how cool this is?
Oh, one question since we are here. I need a wider āwristā, where I can fit 2 suction cups and one spring in the middle. I imagine I will have to custom build this. Iām wondering if there is the plan of the one I have somewhere available that I can use as a starting point for my drawingā¦
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