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I bought this unit a while back, for engraving PCB's (isolation routing), and it just died. It lasted about 10 working hours in total, on and off - of course. Paid only £14 a year ago, shipping included, from a popular offshore online market place. It was described as "500mw 405NM blue purple...

Thank you for letting me onto your forum. I am a maintenance engineer at a big grocery group in the UK. Have been playing with Arduino, Raspberry Pi, audio amps and valves/vacuum tubes for many years. Also started doing the 3D printing thing a few years back, which got me interested in laser...