Can not too much exhaust trench layout. The amount of exhaust trench depends on the perimeter of the details. The total perimeter of the exhaust trench is near equal to 30% of the circumference of the details to ensure the ability to escape the gas. If using 6.35 mm exhaust trench width, there are a total of 12 vent grooves for this part. They can be placed like the picture, or start by placing a vent in each of the four corners, one directly opposite the port and other exhaust trench equally in the remaining regions
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