Method 1: Change into a new non-return valve; prolong the holding time, if there is still no melt cushion, it means the cylinder is broken.
方法一：换上新的止回阀，延长保压时间依然没有料垫，则说明料筒损坏。
Method 1: Change into a new non-return valve; prolong the holding time, if there is still no melt cushion, it means the cylinder is broken.
方法一：换上新的止回阀，延长保压时间依然没有料垫，则说明料筒损坏。
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