Hello, I don't know what it is, but when I press the print button on pronterface, most of the time it starts printing instantly, however, occasionally, when I press, there is no immediate response at all, sometimes it takes up to 10 minutes for it to starting, sometimes it doesn't at all. Before I print I make certain that the bed and extruder meet the target temperture and the gcode is fully loaded. I use reprap i3 with Marlin. Thanks.
