Proximity Switch holder for a REK hot end
thingiverse
This is a Proximity switch holder that I designed after purchasing a Rek-Max3D Comet Hot End off of Ebay. The hot end is designed with a narrow cross section as you can see and it allows the proximity switch to be closer. This reduces the printer head radius. The proximity switch it is designed for is a DC 6-36V NPN NO 3-wire 4mm Non-contact Inductive Proximity Sensor Switch LJ12A3-4-Z/BX. The wire up on my Ramps 1.4 is quite simple. I use the two power wires to the main 12 volt source and then pull the positive of the original sensor wires and connect it to the NPN proximities third wire. This allows the sensor to work without any resistors in the circuit.
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