The number of exhaust grooves necessary
can not be arranged too much exhaust groove. Exhaust slot number depends on the circumference of the details. Total perimeter drains close to 30% gas circumference of the details to ensure the exhaust.
If using grooves 6:35 mm width exhaust, has a total of 12 trench vent for this section. They can be equally spaced as shown, or start by placing a ventilation slot in each of the four corners, one directly opposite the exhaust port and other equally groove in the remaining areas.
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