A setting did not work on my machine. What now?

That is expected sometimes — a library setting is a starting point. Work through the usual variables:

1. Check focus and material thickness first (the biggest culprits).
2. Confirm air assist and lens match what the setting assumed.
3. Nudge power up / speed down for more cut or darker engrave; the reverse for less.
4. Run the Test Grid Generator to bracket around the numbers quickly.
5. Remember tube age lowers effective power on CO2 over time.

When you find what works, Save a private copy with your numbers, and please leave a vote so others know.