Laser Module to 3D Printer Main Board

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Joined Apr 1, 2019
I just recieved a 2.5 Watt 12V laser module and want to connect it to the dan port of my 3D printers main board. The issue is, there are 3 ports on the laser module and only two on the fan port which are for positive and negative. The laser module has 3 ports, gnd, 12v and sw. How do I connect it to my printer?15602914820463323802121988663572.jpg