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Intro
G-code is the language your printer speaks. Knowing a few key commands helps you troubleshoot and customize your prints beyond what the slicer offers.
Basic commands
- G28 — Home all axes
- G1 X Y Z — Move to coordinates
- G92 E0 — Reset extruder position
- M104/M109 — Set nozzle temp (M109 waits)
- M140/M190 — Set bed temp (M190 waits)
Calibration helpers
- M503 — Show current firmware settings
- M92 — Set steps per mm (for E-steps calibration)
- M500 — Save settings to EEPROM
Advanced tweaks
- M221 — Adjust flow rate on the fly
- M900 — Linear advance tuning
- G29 — Run auto bed leveling
Safety notes
- Only send G-code you understand—typos can crash hardware
- Use a terminal (OctoPrint, Pronterface) or printer console
FAQ
Can I edit G-code files directly? Yes—open in a text editor, but back up originals first.
Will slicers add needed G-code? Yes, but knowing commands helps you understand startup sequences.
Wrap-up
Learning a few G-code basics gives you deeper control and helps diagnose problems fast. Keep a cheat sheet nearby while you print.
Thanks for reading! If you have any questions then please drop me a message using the contact form below
Dylan
