MendelMax Emergency Stop Button Mount

by BradDudenhoffer, published

MendelMax Emergency Stop Button Mount by BradDudenhoffer Nov 12, 2012


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This bracket holds an emergency stop button with a 20mm mounting hole. The flanges are sized to match the 20mm Mitsumi extrusions used on the MendelMax


Slide your emergency stop button/switch through the mounting hole and tighten. Use two 4mm screws to mount it to the extrusion.

I have wired mine into the 12V line leading to my RAMPS board. If anything goes wrong just hit the button and all the motors and heaters shut down immediately.

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You say you wired yours in series with your main 12V supply... did you check the maximal current of the switch ?

Most are only rated to 10A, and I believe your printer may use much more than than (with the heaters).

Exceeding the maximum rating of a switch may :

  • Cause a switch malfunction, making it unable to stop the current the day you need it to
  • Cause a fire hazard in some cases

Just a heads up

Just to be safe, it might be a good idea to move the switch to the AC side of the circuit. I am using an 8 amp supply so it would definitely fall within the rated range of the switch. It is up to each person to check the ratings of their equipment before they make any additions or modifications.

Thanks for the heads up. According to the spec sheet this switch is rated for 1200 watts. I am running 12 volts at 15 amps for a total of 180 watts so I am well below the rated power.

The problem is not the watts, it's the amps :)
A 600V 10A switch may be able to handle 6000W at 600V, but only 120W at 12V.

So make sure to look at the max current.

It would probably be best to use the e-stop switch to trigger a relay. 12V 30A automotive relays are less the US$15.


Or alternatively (and it's simplier) you can run the main AC supply through the emergency stop switch, this way you are sure than when it's pressed everything is shut off (including the PSU - sometimes the problem is the PSU itself :))

Another alternative, but less bullet-proof : if you're using an ATX power supply, you can run the "PS ON" wire through the switch, this way when you press it the PSU switches off.