Geeetech

Why sometimes during printing,print stop and say "resume".I click on it by now the piece on bad going into the trash

So far my machine hasnt done this. I have only printed 20 minute long upgrades so far at most. Does it only happen during long prints?

Yep..with long print

Yep, happened to me to, while I was in the tune settings I went back to main info and it said "resume print" while it was still printing. After about 10 seconds it stopped. So I hit the button and it continued. After a few layers it got stuck in a cycle and wouldn't finish printing, just ironing over the same part back and forth without extruding. I have later learned that there is a bug in Cura, where if the ZHop is enabled and set above 0.75mm (mine was, but was hidden) then the print will never complete. Geetech have admitted this problem.