A quick search for ‘laser cutter mirror alignment’ yields tons of resources, so I just offer a quick summary here: The laser beam needs to travel vertically through the center of the lens in order to cut through the material vertically, and to do this in all parts of the workspace, the laser beam needs to be parallel to the X and Y axes. In practice, this involves clipping a little U-shaped sheet metal piece (I used aluminum flashing) with masking tape to the mirror downstream of the one you are aligning, then pulsing the laser twice – once close and once far from the mirror being aligned – and adjusting until both pulses hit the same spot.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.
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