Hex key wound spool

使用了8MM的六角扳手进行半自动绕线。
使用3.5mm木工自攻钉进行固定，预留了2.2mm的孔。
无需支撑，应该也不是很受力，所以2层壁就可以。

An 8MM hex wrench is used for semi-automatic winding.
Use 3.5mm woodworking screws for fixing, with 2.2mm holes reserved.
No support, should not be very strong, so 2 layers of walls can be.