Piezo Bed Leveling Sensor
thingiverse
Simple way to get a reliable Z-Probe without hampering the extruder. It works reliable with my extended Rostock design. Beside the printed parts 3 Piezo sensors, 3 x 1M resistor and an Arduino Nano (to ease the implementation are required. To add some flexibility the bed is mounted by a spring and M3 screw.
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