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Euckid Probe: A highly accurate, magneticaly coupled Z-Probe that is not affected by bed temp, bed material, magnetism or surface treatment. The probe can be configured to be used as Z endstop, be manually or automatically deployed via gcode macros, and takes advantage of the firmware's probe pickup detection scheme to ensure pickup/release. It uses screw attached magnets for both mechanical coupling and for electrical contact. The Z-Probe circuit is completed when the probe is attached.

Screws are used to postivley attach the magnets to the component PCB's. The unique dock design securely captures the probe, providing secure and reliable docking and undocking. As of 7/5/2021, in the process df switch proving, the test printer has sucessivly made over 50,000 deploy and retracts without a docking failure.

The initial design and foundations were laid when the author purchased a Wanhao Duplicator and wanted a 'semi-automtic probe' but was limited by the then current firmware. The Euclid Probe was was then ressurected for use with RepRap Firmware and CroXY 3D Printer, and then adapted to Eustathios-Spider V2. It has since been successfully been implemented on Railcore and Wanhao duplicator i3 printers. Various mount files are included in the CAD and stl folders.

Discussion and support is available as a subgroup to the CroXY Discord- https://discord.gg/jfnVrUx2uK

The same PCB is used for both the upper and lower half, and uses 4, 1/4x1/8 axialy polarized magnets, an SPDT snap action switch, M2 & M3 mounting screws, and some other random bits and bobs you probably have laying about.

The parts list specifies an Omron snap action switch: the most common subminiature size of the Omron D2F switch series, but almost any subminature switch will work. The circuit only uses the Normally Closed (NC) half of the switch as a momentary pushbutton.

Testing has shown that other switches of the same package size will work and their repetability is good enough for use as a Z probe. Reliability testing has shown name brand switches to have a standard of deviation of the trigger point on the order of 0.002mm, and no-name aliExpress and ebay generics to be be 0.004mm- a full order of magnitude better than BLTouch and inductive probes and similar variants.

The operating temperature range of most mainstream switches of this class are 80°C, so theoretically the probe should function in a heated chamber of 60°C.

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