By the LaserCutUK.co.uk — The UK's Home Laser Cutting Authority Team · Updated May 2026 · Independent, reader-supported

How to Laser Cut Acrylic at Home UK — Settings, Tips, and Supplier Guide

Acrylic is the first material most home laser users want to cut. It cuts cleanly, engraves with crisp detail, and creates edge-polished results that look professional without extra sanding. But the difference between a perfect cut and a scorched, sticky mess comes down to knowing your acrylic type and dialling in the right settings for your laser.

Cast vs Extruded Acrylic: Which to Choose

Not all acrylic behaves the same way under laser, and this matters for your results.

Cast acrylic is made by pouring liquid resin into moulds. It's denser, more impact-resistant, and crucially—it cuts cleanly with less melting. The edge quality is better, with less frosting, and it engraves crisply without the gummy residue you get from extruded stock. Cast acrylic also handles higher power settings without cracking as easily. If you're buying Perspex or Plexiglas branded sheets, you've got cast acrylic.

Extruded acrylic is cheaper because it's made by forcing melted resin through rollers. It's softer, more prone to crazing (stress cracks) during cutting, and tends to melt rather than vaporise cleanly. The edge quality is hazier. For hobby work and prototyping, extruded acrylic is fine—you'll just need lower power and slower speeds to manage the melting. Suppliers often stock extruded as "economy" acrylic.

For consistent, professional results, cast acrylic is worth the extra cost. Budget £15–£25 per A3 sheet depending on thickness.

Diode Laser Settings (10–20W)

Diode lasers are affordable and compact, but they're weaker than CO2 machines and generate heat differently. Acrylic doesn't cut well on diodes—the wavelength isn't absorbed efficiently, so you'll need high power and still risk melting without clean edges.

If you're using a diode laser:

• Cutting 3mm cast acrylic: Power 100%, Speed 15–20 mm/s. You'll likely need two or three passes, which increases the risk of edge darkening.
• Engraving: Power 60–80%, Speed 100–150 mm/s. Even with lower power, you'll get smoke and slight charring.
• Air assist: Essential. Without it, you'll get thick smoke pooling on the cut line, and the residual heat will blacken edges.

Diodes work better with materials like rubber, leather, and wood. For acrylic, they're a compromise—you can do it, but results won't match a CO2 laser.

CO2 Laser Settings (40–100W)

CO2 lasers are the gold standard for acrylic because the infrared wavelength is absorbed efficiently, vaporising the material cleanly instead of melting it.

For 3mm cast acrylic:

• Power: 60–75%
• Speed: 25–35 mm/s
• One pass, clean edge, minimal frosting

For 4mm cast acrylic:

• Power: 70–85%
• Speed: 20–25 mm/s

For 6mm cast acrylic:

• Power: 85–100%
• Speed: 12–18 mm/s

These are starting points—dial in from here based on your specific machine. Cheaper 40W tubes may need slightly higher power; professional 80W+ lasers will cut the same thickness at lower power.

Engraving: Power 25–40%, Speed 200–300 mm/s. This gives you edge-frosted detail without charring.

Air assist makes a visible difference. With it, edges are cleaner and clearer. Without it, expect sooty residue and faster tube fouling.

The Masking Tape Trick

This simple technique halves your edge cleanup work.

Stick painter's tape or blue masking tape on both sides of your acrylic sheet before cutting. The tape protects the surface from laser scatter and smoke residue, and more importantly, it traps melted acrylic droplets on the underside, keeping them from bonding to the sheet edge.

After cutting, peel off the tape. Edges come out noticeably cleaner and require less sanding. The tape also prevents minor stress crazing because it holds the material together fractionally longer as it cools.

Don't use duct tape or high-temperature tape—they leave sticky residue. Painter's tape is cheap (£2–3 a roll) and worth doing for every job.

UK Acrylic Suppliers

Castacrylic and Perspex Ltd stock genuine cast acrylic sheets and rods in bulk. Both offer cut-to-size services if you need specific dimensions. Perspex is pricier but stock is reliable; Castacrylic often has better bulk rates.

Makecut and The Laser Cutter Store sell laser-ready cast acrylic sheets pre-sorted by thickness (3mm, 5mm, 8mm) in a range of colours. Pricing is transparent, and minimum orders are reasonable—around £25–£40.

Local sign suppliers often stock offcuts and bulk sheet at trade prices if you have a relationship with them. Worth ringing around your area.

Amazon UK stocks budget acrylic, but quality varies and you're usually paying retail price. Acceptable for testing settings, not for production.

For consistent results, buy cast acrylic only. Check the supplier's spec sheet—it should specify "cast" and optical clarity grade.

Why CO2 Machines Win for Acrylic

If you're considering your first laser, acrylic is one of the strongest arguments for buying a CO2 machine instead of a diode. CO2 lasers cut acrylic in one pass with clean edges, no charring, and minimal post-processing. Diodes require multiple passes, produce edge darkening, and often need sanding afterward.

The extra cost of a CO2 machine—typically £800–£2000 for a capable 40W system—pays back quickly if acrylic work is a priority.

Set your expectations right: acrylic cuts beautifully on a good CO2 laser. Plan your first projects around cast acrylic sheets under 5mm, use the masking tape trick, and dial in settings incrementally. You'll get results professional enough to sell.