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.
Cast Acrylic (Best for engraving) – Produces frosted, even finish
Extruded Acrylic (Best for cutting) – More consistent thickness for clean cuts
Clear acrylic engraves to a frosty white finish
Colored acrylic creates high-contrast engraved areas
| Process | Power | Speed | Frequency | Air Assist | Notes |
|---|---|---|---|---|---|
| Cutting (3mm) | 85-100% | 8-15 mm/s | 500-1000 Hz | On | Slow speed for flame-polished edge |
| Cutting (6mm) | 100% | 5-8 mm/s | 500-1000 Hz | On | May need 2 passes |
| Deep Engraving | 30-50% | 300-500 mm/s | 1000-5000 Hz | On | Creates 3D effect |
| Surface Engraving | 15-25% | 600-1000 mm/s | 5000+ Hz | On | Light frosted finish |
| Vector Etching | 10-15% | 100-200 mm/s | 5000+ Hz | On | For fine lines |
| Process | Power | Speed | Passes | Air Assist | Notes |
|---|---|---|---|---|---|
| Cutting (3mm) | 100% | 50-100 mm/min | 8-12 | On | Very slow process |
| Engraving | 80-100% | 1000-1500 mm/min | 1-2 | On | Best on dark acrylic |
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
Frosted White: Medium power, high speed
Deep 3D: Multiple passes at lower power
Transparent Engraving: Very light power (5-10%) with high speed
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
| Problem | Cause | Solution |
|---|---|---|
| Cloudy edges | Poor focus/air assist | Check focus, increase air pressure |
| Melted edges | Too slow/too much power | Increase speed or reduce power |
| Uneven engraving | Dirty lens/mirrors | Clean optical path |
| Cracks forming | Overheating | Use pulse mode, allow cooling |
| Poor detail | Wrong frequency | Use higher frequency (>5000Hz) |
Always use proper ventilation – acrylic fumes are toxic
Never laser PVC or vinyl – produces chlorine gas
Keep fire extinguisher nearby when cutting thick acrylic
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.
