Semi-Automatic Coldpull
The aim is to let the extruder perform the coldpull for you, since a coldpull can be quite violent method of cleaning out the nozzle.
Using the following Gcode, this was a very successful and repeatable method using the OmniaDrop extruder:
G90
M83
M302 P1
M104 S90 T0 ; the temperature can be even lower, if the coldpull is not effective enough
M106 S255
M109 S90 T0 ; the temperature can be even lower, if the coldpull is not effective enough
G92 E0
G1 E-5 F30
G4 S10
G1 E-45 F600
G4 S5
G92 E0
M106 S0
M104 S0
M84