and maybe these people have never checked if they are cut very precisely parts
The G540 has been in production for quite a few years, and, as I said, has been used by thousands of people. Do you honestly believe NONE of them EVER checked the accuracy of their machines? Are you THAT confident that the problem can't possibly be in your machine, that you're willing to believe all those thousands of satisfied customers are basically idiots? If so, then I urge you to ditch the G540, spend a lot of time and money on G203s, and then when you find you're still in the same position as you are right now, perhaps you'll be a little more willing to listen.
"volts is ok, 3.5 for each 2,4,6,8" - I have no idea what that means.... 3.5V?? Where?? 2,4,6,8?? What is that??
Regards,
Ray L.