Inductive bed sensor

[uncle_bob]

Currently I am using a servo mounted switch for my ABL. Since upgrading the bug fix version of the new firmware I am having intermittent issues with the angle that the servo is being deployed at causing the nozzle to crash into the bed.

I am thinking about upgrading to a inductive probe to take some of the moving parts out of the equation. Will an inductive probe work with the stock maker farm heated bed with glass on top?

Hi

Inductive probes work against conductive surfaces. It the MakerFarm (or any similar) approach, the nearest conductive surface is the heated bed PCB. That is on the other side of your glass and also on the other side of whatever you have on the glass to get things to stick down. Based on what I have here, the heated bed can bow away from the glass by 0.5 to 1 mm. The glass it's self can bow away from the heated bed by about the same amount. Manual bed leveling can get you within 0.1 mm without a lot of trouble. If you want something that works at least as well as manual bed leveling, inductive sensors simply are not the way to go. If you have an aluminum heated bed or a "print on the PCB" setup, then they do work. The MakerFarm (and a few thousand other designs) simply are not built that way.

Bob

[kd7eir]

Inductive sensors work just fine with MakerFarm printers. This is the one that I use and it works fine through 3mm borosilicate glass. It has a sensing distance of 8mm, which works out to about 3.2mm to 3.6mm when you account for the target correction factor of the MakerFarm construction.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Target correction factors http://www.ab.com/en/epub/catalogs/1...y-Sensors.html