Laser Cut K40 LED position indicator

This is a device to help position your laser beam precisely and repeatably, regardless of height of material, focus, or coordinates. Unlike head-mounted laser pointers or beam combiners, it does not add any weight or complexity to the head, or reduce the beam's power. It also helps in finding a rough focal depth.

I didn't invent this; this is just my laser-cut version of an existing design by scorch and before him, Peter Jensen. I don't have a 3D printer, and I thought it was appropriate that laser cutter owners should be able to make this, which should also be a lot faster ;) It's also made from parts so you don't have to destroy a flashlight.

Scorch's video about his version is here, which covers the theory and installation: https://www.youtube.com/watch?v=r4GfdS4GDqs

Required (adjust as you like):
* 4x 5mm clear LEDs (not diffuse), they don't have to be superbrights but that would probably be better.
* a 1k resistor (calculate your own value if you use different LEDs