I recommend Jtech. They’ve got safety shields and goggles too if you need. My first order had a faulty laser diode, but they shipped me a new one no charge straight away. I 3D printed my own mount for my 3D printer. It’s been a lot of fun. You won’t be able to cut very thick materials with these types of diodes. At least nothing like you can with the larger 40+ watt gas lasers.