Simple Touch Probe

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Thanks go out to johank for catching that mistake in the original design! A 3D printed component is now in place to hold the centre contactor together securely. To do this, use a small amount of super glue to attach the M6 nut and the 6mm rods into the contactor. The spring should be tensioned just enough to pull the contacts together lightly. When working with stainless components, the resistance of my probe circuit varied between 20ohms and 200ohms depending on the pressure applied by the spring. Set the spring as light as possible while still reliably triggering your controller input. If the spring tension is too high, the probe will apply more force to the bed before it triggers, which will reduce accuracy. The probe stylus is made from M6 threaded rod or a long M6 bolt. I ground the tip to a 30deg point with a slightly rounded edge, but you can make any shape you need. You can also create threaded tips that screw on, or even 3D print a custom stylus. Here are a few videos of the probe in action: