Magnetic Endstop Prusa i2

thingiverse

This magnetic Z endstop was crafted specifically for my Prusa i2 printer. It boasts high reliability and ease of adjustment. The endstop is made from ABS plastic and polished with acetone for a smooth finish. To build it, you will need M3 x 20mm and M3 x 8-16mm screws, two M3 nuts, epoxy (JB Weld), a 2mm x 1mm Nd-Fe-B magnet, vacuum grease (optional), a small protoboard, an A3144 magnet detection IC, a 22pF capacitor, a 10k resistor, wire, and a connector for your printer's board. Start by creating the circuit using the IC, capacitor, and resistor. Test it with a multimeter to ensure it responds correctly to the magnet's polarity. Mark the identified pole of the magnet for future reference. Carefully JB weld the nuts, magnet, and knob to the adjuster block, ensuring no epoxy touches the threads. Clamp the endstop adjuster onto your X carriage using hot glue if needed. Attach the circuit to the default Z endstop on your Prusa i2, aligning it with the IC chip. For optimal performance, use a small magnet and ensure the correct polarity is facing the sensor. The distance between the IC and the sensor should be 1-2mm. Calibrate the endstop while the bed and hotend are at operating temperature for reliable printing results. Since installing this endstop, I have printed continuously without needing adjustments.