Platform Collision Saver and E-STOP

This thing is meant to protect you from the agony of destroying your Thing O Matic or Cupcake heated build platform PCB by putting your print head through it. It can happen to the best of us.

It is a simple circuit that plugs into the EMERGENCY STOP port on a Thing-O-Matic, although I can easily set it up to work the same way for Cupcake users. Two wires go to your print head and aluminum heat spreader, and detect when they have collided.

While I have a youtube video of the trial run and