Compass design for 3D print update!
More easier, more fun.
The bolt is not necessary, you can use it without bolt, it's for precisely occasion in case.
改进了几处细节，安装子弹铅笔头更方便，另外不用螺栓也可以使用，螺栓仅用于某些需要精确控制的场合。
模型下载 download at：
https://www.thingiverse.com/thing:4240762