The Fabricator · 8 minute guide
Polymer Magazine Tones: A Fiber and MOPA Color Guide
See which light marks a fiber or MOPA laser can make on black, FDE, OD green and grey polymer magazines, burn the free calibration grid on a scrap magazine, and export one LightBurn layer per tone with your own settings.
By Scott Bedow, Founder & Lead Developer · Published October 10, 2026
Manufacturing manager who runs CO2, diode and MOPA fiber lasers; builds and maintains every Reticle Red tool.
Method — Walked end to end in the live tool before publishing. Screens and step order match the current build; settings shown are starting points to validate on scrap.
What this tutorial covers
- A tone chart for five magazine colors, showing which light marks a fiber or MOPA laser can make on each.
- The free calibration grid: what each square changes and how to read it on a scrap magazine.
- Turning your best squares into LightBurn tone layers, and what EZCAD and xTool users set by hand.
- Refining with the free test grid and EZCAD test card, and keeping each recipe on a Burn Card.
1. Pick the magazine color and your laser
In The Fabricator, switch on PMAG TONES under FORGE COLOR, pick the magazine color under MAG and choose FIBER or MOPA under LASER. TONES then lists only the marks your laser can make on that color.
2. Download and burn the calibration grid
Open CALIBRATE and download GRID .LBRN2 (free, no credits). Burn it on a scrap magazine or a spot that will not show. Each square changes frequency and pulse width (MOPA) or frequency and power (fiber); speed, line interval and passes stay the same.
3. Read the grid and record each tone
In daylight, find the square that gives each tone cleanly, with no melting, gloss or bubbles, and pick it under MY GRID RESULTS. It is saved in this browser for that laser type.
4. Fire the design and check the preview
Describe the art and FIRE with FORGE COLOR (6 CR). Check the preview named after your magazine color, such as ON BLACK: the magazine stays the darkest tone and every mark is lighter.
5. Export one layer per tone
Download the LightBurn file from Machine Files: one Scan layer per tone, lightest first, carrying your grid settings. Calibrate every tone first, because a tone with no grid result exports with general placeholder settings. EZCAD and xTool files keep the layers but not the settings.
6. Refine and record the recipe
If no square is quite right, sweep speed or line interval around your best square with the free test grid or the EZCAD test card, then keep the final settings on a Burn Card for that magazine color.
Validate the workflow on your machine
Treat the finished file as a controlled starting point, not a universal machine recipe. Confirm the artwork dimensions after import, verify focus and lens selection, and run a small test on scrap from the same material batch before committing the production piece. Change one variable at a time when tuning speed, power, frequency, line interval, or pass count. Record the machine, source wattage, lens, material finish, focus method, and final settings with the saved job. That short production note makes the result repeatable for the next operator and prevents a strong screen preview from being mistaken for a proven burn.