Tuning hot-end temperature controller

Tuning Gigabot's temperature controller will help keep the hot-end temperature stable at the set temperature and allows it to heat up quickly.

1. Connect Gigabot's power and USB cables.
2. In Pronterface connect to Gigabot.
3. Turn on the head fan by typing M106 S255 command in the lower right corner of Pronterface.
4. If you have previously been printing wait for the hot-end to cool.
5. In Pronterface type into the data entry box at the lower right corner “M303 S200”. This will start the PID auto-tune function in the Marlin Firmware. The hot-end will cycle the heat up and down for a couple minutes until displaying the message: "PID Autotune Complete".
6. Write down the last set of output values given.

Classic PID

Kp: 50.03

Ki: 1.98

Kd: 150.98

Adjusting the firmware

1. In Pronterface disconnect from Gigabot, Close Pronterface, Restart Pronterface.
2. Connect to Gigabot.
3. In Pronterface type into the data entry box at the lower right corner: "M301 P(your Kp value) I(your Ki value) D(your Kd value)".
4. It should look like this using the example above: "M301 P50.03 I1.98 D150.98" This will temporarily change the current settings for the temperature controller.
5. In Pronterface type into the data entry box at the lower right corner: "M500" This will store the changes.
6. In Pronterface: Set hot-end temperature to 200C and watch that it comes up to temp, overshoot the target temp slightly, undershoot temp slightly and then settles onto the target temp within 1-2 deg.