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Anet A8 bed level holder (18mm capacitive sensor)

by LucaCap Nov 10, 2016
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I printed two of these, and they both broke almost immediately. The mounting (that is bolted to the print head) is very weak. The design is good though. I don't understand the comments re tapping the hole. My sensor slid straight in with a firm grip. if the back hadn't snapped off so easily they would be on my printer now.

My bad. I got the settings wrong. All good now. ;-)

Hay que elegir en Skynet 2.3.2 la configuración "autolevel- stock anet sensor" para que funcione ,gracias por el diseño

This by LucaCap is a very lean sensor holder, with a neat design. Very well done !
Two small disadvantages:

  1. the mount is a bit too far from the extruder. It prevents to probe the front side of the hotbed
  2. the need of tap threading the bearing. When I realized it was needed, I was enthusiastic, but I did it, and it worked pretty well (Threading aluminium is not difficult per se, but can be tricky. So: pay attention when doing it!)

These are the off-set settings that I am using on Marlin firmware (1.1.8) (i.e.: X: 32 Y: 62)
'#define X_PROBE_OFFSET_FROM_EXTRUDER 32 // X offset: -left +right [of the nozzle]
'#define Y_PROBE_OFFSET_FROM_EXTRUDER 62 // Y offset: -front +behind [the nozzle]

And these are the settings for probing grid dimensions
'#define FRONT_PROBE_BED_POSITION 55 //if you set less than 55 it results in an error

I read comments of users experiencing the clamps getting loose with use. I didn't experience that so far... Should I have the same problem, I will post an update here.
Thank you LucaCap ;-)

Fits perfect! At the front I really never liked the sensor. Thank you!

Can anyone tell me what firmware they are using with this probe placement? I am trying to compile Skynet 2.3.1.

I used these values in the Configuration.h file because those are the values in mm that I measured.



When I try to verify/upload, I get this sanity check error:

"The given FRONT_BED_POSITION can't be reached by the Z probe."

What am I doing wrong?

You need to adjust the FRONT Bed Postion. Because your sensor is now behind the nozzle.
Use this one in your Skynet config:


my linear bearing doesn't seem to be threaded all the way through. does anyone else have this issue?

I remixed this fantastic thing and equipped it with dowels. Therefore one can simply use M3 screws to secure the brackets!


ANET A8 | Rear Bed Level Sensor Holder (18mm, 12mm & 8mm)
by TNS

Alas I read of your remix only AFTER I had tap threaded my bearing... :-(
Thank you in any case :-)

Yes, I just printed these out and they came out beautifully!! Sadly, no threads. Only way to fix that is to have a tap kit and tap threads into the holes. I'll be saving these as I like this placement better than the other brackets and they all seem to be so thick.

try to cut the screw

What good will that do if there are no threads in the bearing where it shows the bracket to be mounted?

Same thing for me. i guess our option is to tap the bearing.

What offsets are used with this sensor?

I second this question.

very pretty. Is it possible to touch the sensor with the clamp that holds the bed and the glass?

Best regards
Jose Lorenzo