Capacitive sensor FAILS for 3D Printer

Capacitive sensor FAILS

Zero on the left of the bed is set perfect but moving to the right the nozzle is about 1mm above the bed when zero is selected.

It appears that this sensor is triggering at different distances depending the position on the build plate.

If it sensors the distance then it should be the same distance from the bed when set to zero. Even if the build plate is not physically level.

LJC18A3-B-Z/AY PNP NC 3-Wires 10mm

Capacitive Proximity Sensor Switch DC 6-36V

Product Name: Proximity Switch

Specifications Model: LJC18A3-B-Z / AY

Outside diameter: Φ18

Dimensions: 78 x 30mm/3.07 x 1.18"(L x Dia)

Total Length:127cm/50"

The detection method: Capacitive

Detection range: ± 10mm (mm)

Operating voltage: DC6-36V

Output Type: PNP NC(normally closed) 3 Wire

Color:Grey and Silver

Weight:86g

eBay seller : gobuyteam

Proximity sensors, however, is the trouble they have compensating for changes in the environment over time. Changes in
humidity, for example, dirt collecting on the sensor area, or a change in the moving object can impact sensitivity and reduce performance.

http://www.nxp.com/documents/white_paper/NXP_DigiKey_CapacitiveSensors.pdf

Protomaker Black Sprint Original 3D Printer

Protomaker 3D Printer was advertised for spares or repairs.

It may take some time to get this 3D printer working to a level where it is usable due to lack of budget.

Powder Coated Mild Steel Structure With Acrylic Build Platform
Product Type : All In One Printers
Cartridge Type : Original
Utility : 3d Printing
Printing Output : Colored
Print Technology : Fused deposition modelling (FDM)
Size : Large
Other Features : Powder Coated Mild Steel Structure With Acrylic Build Platform

SUPC: SDL051787633

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Protomaker Black Sprint Original 3D Printer

https://protomaker3dprinter.wordpress.com/

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