This effect is called oozing. At the end of heating up the hot end, left filament becomes so liquid that it oozes out of the nozzle. This left filament could be a left over from the previous print where an insufficient retract prior to the last print finish causes this (you could retract the filament a little further in your "end G-code" script, first reset the E to zero G92 E0 and then retract G1 E-3, be sure that the priming length in your "start G-code" takes care of this distance).
0scar ♦
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