Best Laser Settings for Engraving and Cutting Acrylic Sheets (2025 Guide)

Acrylic (PMMA) is one of the most rewarding materials to work with using a laser engraver/cutter, producing clean edges and beautiful engraved effects when proper settings are used. This guide covers optimal parameters for both engraving and cutting acrylic sheets.

Understanding Acrylic Types

1. Cast vs. Extruded Acrylic

• Cast Acrylic (Best for engraving) – Produces frosted, even finish

• Extruded Acrylic (Best for cutting) – More consistent thickness for clean cuts

2. Clear vs. Colored Acrylic

• Clear acrylic engraves to a frosty white finish

• Colored acrylic creates high-contrast engraved areas

Recommended Laser Settings

For CO₂ Lasers (40W-100W):

For Diode Lasers (5W-20W):

Pro Techniques for Perfect Results

1. Achieving Crystal-Clear Cuts

• Use cast acrylic for best edge quality

• Apply masking paper to both sides to prevent flashback

• Maintain perfect focus (slightly lower than material surface)

• Use compressed air assist for flame-polished edges

2. Creating Different Engraved Effects

• Frosted White: Medium power, high speed

• Deep 3D: Multiple passes at lower power

• Transparent Engraving: Very light power (5-10%) with high speed

3. Working with Colored Acrylic

• Dark colors produce highest contrast

• For two-tone effects, engrave through top layer of dual-color acrylic

• Red and black acrylic show engravings most vividly

Troubleshooting Common Acrylic Issues

Safety Considerations

1. Always use proper ventilation – acrylic fumes are toxic

2. Never laser PVC or vinyl – produces chlorine gas

3. Keep fire extinguisher nearby when cutting thick acrylic

4. Wear protective eyewear specific to your laser wavelength

By using these optimized settings and techniques, you’ll achieve professional-quality acrylic engravings and cuts with smooth edges and beautiful finishes. Always test on scrap material first when trying new settings or working with unfamiliar acrylic types.