导弹发射架笔筒

内置了一个 608z轴承，没有轴承的可以用户我提供的打印版厚垫片代替，只不过就不会旋转的那么顺滑了。

There is a built-in 608Z bearing, and if there is no bearing, you can replace it with a printed version of the thick gasket provided by the user, but it will not rotate so smoothly.

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