laserGRBL 如何定位开启弱光？
①发送M3 S10 开启弱光（如果没有弱光射出，发送指令后，先点击定位，再点击归零弱光就出来了）
②将光点调到原点位置点击定位。
②将光点调到原点位置点击定位。
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