EVA foam is the material of cosplay, tool inserts and game mats. It cuts very easily with a laser, with a smooth heat-sealed edge no knife can match.
Settings: what really matters
EVA is soft: very little power is enough and speed can stay high. Too much energy melts the edge into a bead and shrinks the foam around the line.
On thick foam (8 to 10 mm), one slow pass gives a straighter edge than several fast passes, which carve a V.
When engraving, EVA carves into very readable relief: perfect for armour textures or labelled tool pockets.
Risks and finishing
EVA (ethylene-vinyl acetate copolymer) contains no chlorine and remains laser-safe, but molten foam smoke is dense and irritant: extraction is imperative. Beware foam of unknown origin, sometimes filled or plasticised.
Foam ignites on a slow cut: do not leave the machine.
The sealed edge takes paint and contact cement very well, unlike a knife-cut edge. A light pass with a heat gun smooths the surface further before painting.
Every figure on LaserSettings comes with the machine, the laser source, the material and the thickness it was tested on. A setting published for a 10 W diode says nothing about a 40 W CO2, and a setting for 3 mm says nothing about 6 mm: check those four things before you copy any number.
Settings are confirmed or disputed by the members who reproduce them, so reliability comes from cross-checking rather than popularity. Photos of the result — cut edges, engraving shades, scorching — tell you more than a single number found on a forum.
Whatever the material, treat a published setting as a starting point: run a small power/speed test grid on an offcut, clean the lens, redo the focus, work with fume extraction and air assist, wear glasses rated for your wavelength and never leave the machine unattended.