I have solve all my past problem with my printer, and now its start to print good.
but i see the extruder take always more of 5 minuts for be operative....sometime the percentual bar when is near to 80% come back in 40%.....??? why??.
at least in all cases the extruder always arrive in temperature and the print start, but its normal need all that time for arrive in temperature?
That sounds like a Ribbon Cable Issue, try moving the Ribbon Cable around while it is heating and watch to see if the bar jumps a lot. This happened on my machine and it was always going to 40% when the connection was broken.
You can also use Tinfoil to close the gap in the heater cartage if there is one, this may help reduce start up times. I used it on my machine and i'd say I have saved around a minute each print because of it, a small improvement but one that has results.