How to express dwell time in G-code I am writing some G-code for my DIY 3D printer. From what I understand, `G4` is dwell and its expressed in milliseconds. So my extruder takes about 30 seconds to heat up. Do I just type G04 30000

You are correct about needing to specify the dwell value in milliseconds. However, the RepRap Wiki indicates that you need to use the `Pn` argument, and not just an unadorned number as the argument to the command. To adapt the Wiki's own example, you will need to use:


G4 P30000


This should cause the firmware to dwell (pause) for 30 seconds.

RepRap Wiki: G4: Dwell