I have kept my gob shut so far cos it's all been said before many times.
You won't get any more than a scorch from a low powered laser and not even that on a shiny surface.
The 60 quid ones you're looking at are no more than recycled cd /dvd burners from confusers or at least that's where the originated.
I built one similar to this before buying my cnc machine, usless article for anything more than burning paper.
Don't waste your money init?
Keeping focus alone is not enuf, it needs to be capable of adjusting the power accordingly or turn the subject with a fourth axis to maintain depth of burn.
The term laser cutting is inaccurate, you are cutting indeed but with a burner, much like blasting through with oxy acetylene in fact cnc is often used for pin point accuracy with such.
A learning curve is required when playing with lasers first and foremost SAFETY you won't be burning much when your eyes have been scorched.
Too little power no burn, too much power, dial 999 or at the least subject in cinders or melted.
Software: There is free software available and plenty of it, I use F-Engrave and Linux cnc only because that's what I am familiar witth and need no more for engraving.
