I made an inductive endstop mount for z-axis.

I made an inductive endstop mount for z-axis. May also be used for auto bed leveling. It is mounted with existing screws . One on cooling duct mount and one on hotend fan mount. I tried a few versions, but this place for mountig is the one where i lost minimal build volume. Only 3-4mm on y axis. When @Eclsnowman has set up his github for modified parts, i will upload there.

Great job, I hope to have time tonight to set up the folder structure so people can begin uploading.

@Florian_Schutte How are the results when the bed is hot ? I was told that those sensors goes bunkers when they try to sense a heated area ?

@Jean-Francois_Coutur no issues here on my Delta printer

@Eclsnowman Thats great news. It should be a standard feature on all printers :slight_smile:

@Florian_Schutte Could you tell us where you got the part ?

To be honest, I didn’t really tried to use it until now. I have to remove my glass plate to detect the bed (detection distance ~2-3mm, but 4mm glass). The problem is, that i can’t bring the bed up anymore because i use old bed supports with new carriage. But new parts are on their way.
@Jean-Francois_Coutur It’s a standard sensor called LJ12A3-4-Z/BY. You can find these for a few bucks on ebay or amazon. They have 12mm OD and a detection distance of 4mm. But it does not react that much on aluminium, so you end up at ~2-3mm. There is also an other sensor with 8mm detection distace, but it has 18mm OD (LJ18A3-8…). So you will lose some millimeters more in build volume.

I found that the ebay sensors will only detect 1mm away from my aluminum sheet- so it won’t work even with 1/16" glass. Some people add a thin galvanized steel sheet on top of the aluminum which has more inductance - I haven’t tried that yet.

As i say. My Sensor works at 2-3mm. Maybe i will try the 8mm version when i habe time for that.

maybe there are differences between ebay sensors. This is the one I got: http://www.ebay.com/itm/221457637744?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT - the only difference in the number is /BX (LJ12A3-4-Z/BX ) which is an NPN. Maybe the PNP version is able to work for 2-3mm while the NPN only 1mm.

I got this one: http://www.ebay.de/itm/New-LJ12A3-4-Z-BY-Inductive-Proximity-Sensor-Detection-Switch-PNP-DC6-36V-/351323770970?hash=item51cc87505a:g:MX4AAOSwfcVUBFG-
Manufacturer is called “SHNRQ”. Maybe tere are differences between manufactueres. As far as i understand electronics, the difference between NPN and PNP is that PNP is normally open (NO) and NPN is normally closed (NC).

Maybe voltage makes a difference- I am only using 12v?

Glad I read this, I’m about to finally add the one that came with my delta but I’ve added a glass plate. You guys might have saved me some trouble shooting already :slight_smile:

@Chris_Brent on my Delta I am using an aluminum heated bed with mirror glass on top no problem (http://www.amazon.com/Signswise-Aluminum-Heatbed-Heated-Printer/dp/B00VG7HDEC http://www.michaels.com/artminds-round-mirror/M10025203.html). I also coat the mirror glass with 3D-EEZ by @argas231 . To me this setup with inductive bed level probing is a winning combination.

Thank you… and our newest formulation is even better 3D EeZ Rules