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  • LJC 12A3-4-Z/BX /NPN Capacitive Proximity Switch for printer A30
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LJC 12A3-4-Z/BX /NPN Capacitive Proximity Switch for printer A30


Shipping Weight:75g

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This capacitive proximity switch is designed to improve the accuracy and efficiency of the auto leveling process for 3D printers. Able to detect both metal and non-metal building platform.

For those who 3D print a lot or 3D printing beginners, it makes leveling the build platform a no-brainer. This kind of proximity switch will enable your printer to take several bed leveling readings and calculate a level plane so your prints are always level. While printing each layer, you z-axis will be in constant motion to compensate for an un-level bed.


· Save time messing with springs and screws on your print bed. Run the Auto-level procedure before every print or just one time for each start-up of the printer.

· Less issues related to un-level print beds like parts coming up on one corner and nozzles jamming because the print starts too close.

Note: For Geeetech 3D printers, this capacitive proximity switch can only support A30 3D printer at present. Before your purchasing, make sure that the firmware of your printer is compatible with it.


Product Features:

Model: LJC 12A3-4-Z/BX

Output Type: NPN

Supply Voltage: DC 6-36V

Power: 500~600HZ

Detection Distance: 5-10mm (±5 adjustable)

Operating Temperature: -25~ +75

Wire Length: 15cm

Dimension: 12*60mm

Made from copper




Package include: 1pc x Capacitive Proximity Switch

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  • araken lotufo | 03/21/2018

    Is it compatiblw with prusa m201

    • Maria Olivier | 03/31/2018

      Hi Araken,sorry for late reply.Yes,but you neet to exchange the bracket of installing 3D touch module.

  • Arthur Gevaerd Neto | 01/10/2018

    Is it comnpatible with PRUSA I3 X? do u send us the code?

    • Zina Luo | 01/15/2018

      Hi Arthur ,yes ,but need resive the code by yourself .You can search some more on facebook or google for help.

  • Felix Manuel Manso Rojero | 11/24/2017

    Is it compatible with Prusa I3 Pro C dual extruder? Is it better than 3D Touch sensor?