try in english, maybe it would be easier to understand.

I asume U mean that filament goes out from extruder after heating before print start...?
if that so U should not wait for long with start after heating. Some filament will go out everytime extruder will get hot enough for filament to flow. Unless U switch off the gravity. U can try to retract filament, but then U will have to spend some time for extrusion to start at printing.