Short Shot (Incomplete Filled Parts).

Short Shots occur when the part does not completely fill. Possible Solutions Increase back pressure. Increase injection pressure. Increase injection speed. Increase the melt temperature. Increase mold temperature. Increase nozzle temperature. Ensure that the manifold and nozzles have reached the set temperature. Increase the shot size and confirm cushion. Make sure mold is vented correctly and vents are clear. Confirm that the non-return valve used is not leaking excessively. Increase the switch over pressure, distance, or time (whichever method is being used) point from fill to hold so the fill stage is used longer. Change part design. Thin areas of the mold may not fill completely, especially if there is a thick to thin transition, or there is a long rib that cannot be vented very well. If the part design allows it, change in these areas can improve the situation.