4000mW Laser Engraver Module, 450nm Adjustable Focal Laser Head for Wood, Paper, Leather Cutting & Engraving, Class 4, DIY Laser Cutter, 4W

This is a great little laser, 35X35 mm, but it delivers every bit of 4 watts of optical power. Hard to beat for this price. It can easily burn pine at 500 mm/ min with 35% power. It can cut thourgh chip board (like a cereal box) at 100 mm/ min. I have not tried to cut plywood, but it should be able to handle 1/8 inch at 100 m,/min full power. It is defintately not strong enough to engrave on any raw metel. I have tried aluminum and ss. no impact even at 20mm/min and 100% power. One negative is that the lens barrel is 10 mm instead of the standard M9 .5pitch. Even though you can change the focal length (by turning the lens), I could not get it to focus under 24 mm. The lense can be removed, but it is an odd size. It appears to be an m10 .5 pitch threads.

Perfect. Works well and fits perfectly,

This little powerhouse gives you that extra kick needed, with a pwm module it is very tunable, has an awesomely tight focal point, and even at 100% power stays relatively cool and the forward air flow through the heatsink/body pushes smoke away quite easily, for less than $60 I doubt you're going to find better, at least in a DPSS laser module. I've wandered between 5mw up to 50000mw over 40 years of laser experience, and an important thing to know is that the laser, although I have not officially tested it, is kicking out the 4, 000mw it claims, and might even be a little closer to 5 or 6,000mw, it's power output from my experience tells me you're getting exactly what they advertise, and perhaps a bit more. I consider it an excellent purchase, but with one caveat, this needs to be run with a pwm module, if not, you can wire it directly to your power supply, (Whether that be a 12 volt plug in adapter or a regulated power supply) no harm will come to the laser from this type of hookup. This is perfect for the laser enthusiast who does not intend to engrave with it and wants to hook it up directly to a 12 volt DC power source, I suggest using one that is rated at 3 amps or better. One final thought, if you wish to connect it directly to a DC power supply you must also connect the pwm module lead, (yellow) to the positive, (red) lead to get it to function, just remember if you do this it runs at 100% power all the time, but won't hurt the module. To simplify, you will have to cut off the connector of your power supply, and one end of the three lead red-black-yellow connector cable and solder those two together cables together, so basically you have a black to black connection, a red to Red connection, with the yellow lead also connected to the red to red connection. Simply plug in the connector to the laser module, then plug in the adapter, I suggest using shrink tubing on all solder connections. Watch out though, at 100% power even if highly unfocused at 3 to 5 ft will cause painful burning on your skin within seconds.

Came quick to Canada. 3pin cables included. Plug and play. Focusing works great.