Railcore Emergency Stop

prusaprinters

You will need: Any 19mm diameter emergency stop latching button. The one pictured works great and can be found here: https://smile.amazon.com/gp/product/B07FRYD9WK/ SPDT power relay: https://smile.amazon.com/gp/product/B07587NZTC small connectors: https://smile.amazon.com/gp/product/B01N2O2CS4 14 gauge stranded wire (hot=black, neutral=white) 1/4" spade connectors for 14 gauge WAGO electronics box corner, can use either: for 221 https://www.thingiverse.com/thing:3914814 or for 222 (as pictured here) https://www.thingiverse.com/thing:3542340 This is wired directly to AC supply and cuts the hot (aka "line") from the circuit. Note that the incorrect coloring was used in the old kit as seen in my pictures, but the new kit wiring uses the correct black (hot) and white (neutral) wiring. The power is wired through the Normally Closed relay contacts and the Normally Open button contacts so the relay opens when the emergency stop button is pressed. This is not the "correct" way to wire an emergency stop, but this method saves wear and tear on the power relay, thus reducing the chance of failure. It is essentially the same as turning the power switch on the back of the printer off, but that method is not always quick when your bed is crushing your nozzle or during any other unexpected failure. You can find the wiring diagram I used about 3/4 down the page here: https://www.instructables.com/id/Emergency-Stop-Button/ Of course, you could use this STL for any type of 19mm button, including momentary switches to perform macros if desired. Fusion360 file is included in case you'd like to remix my remix. :) Category: 3D Printer Parts