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A strike plate lock can be a good substitute for the Lockitron. Amazon carries them for about $12.00.
Raspberry Pi Class
If you mount the lazy susan to the top, then remove it and mount it to the base, you can then just drill one hole 45 off and use it to access the top for reattachment.
You might want to experiment with NeoPixel lighting strips, you can get any color out of them and the prices have gotten really reasonable.
If you put a nut on before the washer and wing nut you can use it to clean the threads after you cut the bolt. Simply cut the bolt then unscrew the nut and it will clean off any burrs from the cutting.
You could also use an ATtiny in place of the Arduino. It would reduce the circuit size quite a bit but the code would be a little more involved as the ATtiny does not have TX/RX pins so you would have to use some of the ATtiny Serial offerings.
Welcome to Laser Cutting
Laser Cutting Class
Basic Electronics Skills for Robotics
Getting Started with Robots
I didn't view the video so I missed that detail. Thanks for pointing that out.
FYI, that is how I managed to cut off a finger on my table saw. Using the saw with no blade guard and holding the material with my hands instead of a pusher.
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