Tuning hot-end temperature controller

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With the extruder cooled off:

In Pronterface type into the data entry box at the lower right corner “M303 S195”. This will start the PID auto-tune function in the Marlin Firmware. It will cycle the heat up and down for a couple minutes until displaying the message: PID Autotune Complete

Read the last set of output values given

Classic PID
Kp: 50.03
Ki: 1.98
Kd: 150.98

In Pronterface disconnect from Gigabot, Close Pronterface, Restart Pronterface

Connect to Gigabot

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)

It should look like this using the example above: M301 P50.03 I1.98 D150.98

This will change the current settings for the temperature controller.

In Pronterface: Set hot-end temperature to 195C 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.

These kp, ki and kd values (M301 P50.03 I1.98 D150.98) should be copied and pasted into the start g-code in Slic3r

Slic3r -> Printer Settings -> Custom G-code -> Start G-code

or

Simplify3D -> fff settings -> Scripts -> Start G-Code

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