Acrylic & Plastics Laser Cutting & Engraving

Cut cast acrylic in a single pass, at a power and speed that melts the edge cleanly rather than hacking at it, with minimal air disturbance right at the cut line. The clear edge is molten acrylic re-flowing and freezing smooth — anything that cools it too fast or interrupts it leaves a frosted or ridged edge instead. That means the two most common mistakes are running multiple passes, and blasting air assist on the assumption that more is always better. Boss’s published starting point is 80/75/65% at 10–20 mm/s for 1/4″; take that to a scrap piece and adjust in small steps, changing one variable at a time.

They are made differently and they behave differently under a laser. Cast acrylic is poured and cured in a mold; it engraves to a bright white frost with strong contrast and gives the clearest cut edge. Extruded acrylic is pushed through a die; it is more dimensionally consistent and cheaper, cuts with very clean edges, and melts more uniformly — but it engraves shallow and dull, with far less contrast. The practical rule: if the piece is engraved, buy cast. If it is only cut, either works, and extruded may save you money. Suppliers do not always label it clearly, so ask.

That frost is the effect you want, and cast acrylic produces it — the engraved surface goes bright opaque white against clear stock, which is why cast is the standard for awards and signage. Extruded acrylic engraves faintly by comparison and reads grey and washed out. So if half your stock frosts nicely and half does not, you almost certainly have both types on the shelf. Before you spend an afternoon chasing power and speed settings, confirm which sheet you are actually running. No setting turns extruded into cast.

Masking protects the surface from smoke residue, which matters more on engraving than on cutting. The usual approach is to leave it on to keep neighboring areas clean and remove or score it where the beam actually cuts, so the mask does not fuse into the edge. Whether the engraved artwork reads better masked or unmasked genuinely depends on the piece — run both on a scrap of the same stock before committing to a full sheet. It costs one small test and saves a ruined run.

Boss publishes settings for 1/4″ in a single pass, and that is the number we will stand behind. Thicker acrylic is cut routinely — more power, slower speed, sometimes multiple passes — but Boss does not publish a chart past that thickness, so any specific figure for 1/2″ or 3/4″ would be us guessing on your behalf. What is worth knowing is that thickness affects edge quality as well as feasibility: the thicker the sheet, the harder a perfectly clear edge becomes. Tell a specialist the thickness you cut most often and they will size the machine to it.

No on both counts. A fiber laser is the wrong tool entirely — its 1064 nm wavelength is built to be absorbed by metal, and acrylic is a CO₂ material. As for power, acrylic work is usually limited by bed size, not wattage: the wall people hit is the sheet not fitting, not the beam not cutting. The HP series exists to cut thin sheet metal, so buying one purely for acrylic means paying for a metal-cutting head you will never switch on. If you cut only non-metals, an LS sized to your stock is the right machine.

PVC and vinyl, never. They release hydrogen chloride gas, which is genuinely harmful to whoever is in the room and corrodes the machine from the inside out — there is no power setting, no extraction setup, and no material thickness that makes it acceptable. Beyond that: polycarbonate (Lexan) engraves acceptably but cuts badly, yellowing and scorching; ABS melts rather than vaporizing and can emit cyanide compounds; fiberglass and carbon-fiber composites give off fumes from the resin binder and do not cut cleanly. Anything with an unknown coating or laminate is a no until someone produces the SDS — if nobody can name the material, nobody can say what it off-gasses.