Platform Collision Saver and E-STOP

thingiverse

This DIY emergency stop system protects Thing O Matic or Cupcake users from damaging their heated build platform PCB by accidentally colliding the print head with the platform. It's a simple circuit that plugs into the EMERGENCY STOP port on a Thing-O-Matic and can be modified for Cupcake users. The circuit consists of two wires connecting the print head and aluminum heat spreader, which detect collisions. The inventor has posted a YouTube video demonstrating the trial run, but it is still a work in progress. The system needs to be tested during an actual print, and an electronics expert should audit the design. A Cupcake version and further testing with Kapton tape are also required. The firmware needs to be updated for the estop button to function on all axes. To build the circuit, you'll need a 10k resistor, some wire, and an optional LED and resistor for a cooler design. A CD-ROM drive audio cable is suggested for connecting to the motherboard. Before use, test the system by touching a jumper wire between the aluminum heat spreader and nozzle while the steppers are in motion. Feedback and suggestions for improvement are welcome.