Review on 3000mw laser engraving machine, by Danuta Retmaska ᠌

He practically cannot work on metal: more precisely, work on metal is unstable and depends on the phase of the moon. Sometimes it can engrave normally on aluminum, and sometimes it drives a laser for a long time without a visible result on the material. I don’t even put brass and steel, as well as oxidized aluminum, so as not to spoil the die in vain. Faulty software or firmware: when engraving the text specified in the program, it can burn out the first letter and ignore the rest. When the laser descends below 6 cm downwards (when engraving on a plastic card 85 × 54 mm, for example), it may start doing something incomprehensible (including going beyond the boundaries of the print object), but it will not go lower. As a result, you need to keep draft material on hand, on which to pre-run the planned print, so as not to spoil the good dies in vain.