I'm building a cnc laser engraver and have a few questions. I bought a 2w 445nm laser with x drive and lens from dtr shop. The first question I have is about the duty cycle, I believe it states run it for 90 seconds then off for 30. Some of the projects I'll be engraving could last up to an hour. Can I run it any length of time with a heat sink and fan? It seems other people are doing it without problems. My other question is about a power supply. It says it needs between 6-8v, I have plenty if 12 and 24v supplies but nothing in that range. Do I need to buy one or is there a circuit with resistors I can build and use the 12v without limiting the current to much. Its a 12v 2.5 amp power supply. Thanks