Introduction
PID (Proportional Integral Derivative) is the control algorithm the printers use for holding temperature. The parameters for this algorithm control how fast the printer reaches the set temperature and how well it holds that temperature once it gets there. Fortunately, the printer has an automatic way of tuning these values.
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The M303 command runs the PID tuning. It uses the following format:
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M303 E<extruder> S<temperature> C<cycles>
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Example: M303 E0 S240 C3
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The E option is not required on single extruder machines (except Smoothie). To tune the heated bed, use P1 (Repetier), E-1 (Marlin, others), or E1 (Smoothie). On multi-extruder machines, use the number of the extruder you want to tune (starting with 0).
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S is the temperature you want to run the tuning at. This should be close to the temperature you will use for printing.
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C is the number of cycles of tuning to run. We recommend 3.
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Once you run this command the autotuning process will start. The printer will cycle the temperature up and down over the course of several minutes.
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As the tuning runs, the printer will calculate values for Kp, Ki, and Kd. When it is done, take the last three values provided and set these using the M301 command. For this example:
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M301 P29.31 I3.88 D55.42
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In the case of multiple extruders, these settings will be applied to all of them.
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For the bed, use M304 instead.
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3 Comments
Sorry but I don't have any other commands for you to try. The Robo uses Marlin firmware, and the Marlin documentation says to use E-1.
http://marlinfw.org/docs/gcode/M303.html
Maybe the Robo is on an old version of Marlin that didn't have this feature yet.
What is the process for the bed tuning? The line in step 3 that says use m304 doesn’t tell me anything. Is m304 used to start the auto-tune? If so, are there any parameters that go with it? Where do you enter the constants?
