G4 causes a pause in the G‑code execution. During this time, the printer performs no movement and does not extrude.

Two ways to specify the duration:

• P = milliseconds

• S = seconds

Sample Code

G4 P500      ; wait 500 ms
G4 S2        ; wait 2 seconds

Typical use cases:

• Heating or cooling delays

• Waiting for fans to spin up

• Extruder stabilization

• Custom macros (e.g., filament change routines)