Ok I know that this been asked before and I believe I read all the threads on this.
I just bought one of those Ebay k40 China craps. Been having problems when engraving a picture where the machine would stop about 3/4 inch into it. I have tried to e-mail the company for over a month or two, and their "specialist" is looking into the problem. I had 20 people that wanted pictures and now I have none.
I have decide to try and figure it out my self and found that the beam alignment was off big time where the beam was not even hitting close to 3rd mirror. With some work I got it close.
But this is as good as I can get any idea what I could do?