KEYES ROSTOK Manual And Manual page 94

Push the state of the RepRap machine onto a stack. Exactly what variables get pushed depends on
the implementation (as does the depth of the stack - a typical depth might be 5). A sensible
minimum, however, might be
1. Current feedrate, and
2. Whether moves (and separately extrusion) are relative or absolute
M121: Pop
Recover the last state pushed onto the stack.
M126: Open Valve
Example: M126 P500
Open the extruder's valve (if it has one) and wait 500 milliseconds for it to do so.
M127: Close Valve
Example: M127 P400
Close the extruder's valve (if it has one) and wait 400 milliseconds for it to do so.
M128: Extruder Pressure PWM
Example: M128 S255
PWM value to control internal extruder pressure. S255 is full pressure.
M129: Extruder pressure off
Example: M129 P100
In addition to setting Extruder pressure to 0, you can turn the pressure off entirely. P400 will wait
100ms to do so.
M130: Set PID P value
Example: M130 P 0 S 8.0 # Sets heater 0 P factor to 8.0
M131: Set PID I value
Example: M130 P 1 S 0.5 # Sets heater 1 I factor to 0.5
M132: Set PID D value
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