Tune your 3D printer extruder speed.
G-code commands are for Marlin.
Run the extrude command: G1 F250 E100 and wait for it to finish. If your firmware prevents too long extrusion, then split the command in two or use shorter length.
How many lines visible?
Save settings command: M500
You may still have to adjust your extrusion multiplier separately when printing special filaments such as flexibles. This is done in the slicer.
For bugs, please contact me at the email address below.