在筒体的上边设有观察清理孔，因而清理方便快速。
The upper side of the barrel body is provided with an observation cleaning hole; therefore, the cleaning is convenient and quick.
在钻进过程中，应随时清理孔口积土，遇到塌孔、缩孔等异常情况，应及时研究解决。
In the drilling process, should be kept clean hole soil, encountered hole collapse, shrinkage and other abnormal situations, timely solution.
提示：有多个逸出孔，有利于成品中树脂耗材的排除，同时，也有利于后期处理过程中使用清洁溶剂清理你的模型。
Tip: having multiple holes makes it easier for the resin to escape, and for the cleaning solvent to clean out your model during post-processing.
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