I’m using proximity sensors for my limit switches. If you are having trouble with your Z axis limit switches not working, try swapping the connector over to the Spindle Enable pins… There are two versions of GRBL, one that uses the old z limit and one that swaps it over. I also hooked up a touch probe and created a macro so it measures the z height of your work accurately by finding the height at medium speed, then again at low speed.
Buy the Proximity Sensors here: http://ebay.to/1IewFuX
Buy the Arduino & Shield here: http://ebay.to/1jnHdMr
Buy the Stepper Motors here: http://ebay.to/1Ngc89u
24V Power Supply here:http://ebay.to/1Pg55zZ
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