Auto bed leveling

demillertime

I just completed the auto bed leveling mod and everything went pretty straight forward. Not too difficult. I tried running it though and my extruded is extruding quite a distance away from the bed. Do I just need to adjust my z start down closer? Or is there something else going wrong here?

https://youtu.be/s0J1Xhn0AHs

Samuel Pinches

Yes, you need to set your z-offset:

http://marlinfw.org/docs/gcode/M851.html

Then save to eeprom, and then rerun auto bed levelling.

Hevilp

How did you archieve the Auto leveling? Is there are a Tutorial? 

demillertime

Not yet, a couple people have been talking about it but not a full one. If noone does I will possibly do one when i get my z offset figured out

demillertime

Thanks Sam. I manually connected and sent the commands then lowered the Z axis to 0 until i felt resistance on the supplied green card. Ended up going with -1.7. Will let you know how it goes!

Samuel Pinches

Awesome - good luck! 

Samuel Pinches

I'll hopefully make a full auto bed levelling video within the next week.

demillertime

Went to -2.2 before I got a good print to stick. Last question will this tip fit the printer?

https://www.matterhackers.com/store/l/olsson-ruby-nozzle-175-x-040/sk/M9EQEEFM?rcode=GAT9HR&gclid=EAIaIQobChMI3t-g0p6V2gIVAobICh0FrwS_EAQYASABEgIx9_D_BwE

Samuel Pinches

I can’t say with definite certainty, but it looks like it should. They claim compatibility with the e3d V6 nozzle standard, Which I have had good luck with using on the A5.

Hevilp

You got the wire plan? I want to install the bltouch  but the are no wire pictures... 

Samuel Pinches

Have a look here:
https://www.antclabs.com/bltouch

I have not tried it... I think there are two wires as a z endstop switch, and three wires for the servo connection.

servo connection on the MKS Gen l is on the bottom right.

Samuel Pinches

There’s also some discussion here: https://www.thingiverse.com/thing:2827340/

g_pwn

I had the same issue, turns out i had data and VCC swapped!

BananaBruno19

Does the printer come with the auto bed leveling feature? If so, how do you start the bed leveling process?

Samuel Pinches

@BananaBruno19 - welcome! No, from factory it is manual bed levelling. There is an assistant, but it is not able to correct for non-flat beds. With community firmware you get manual mesh bed levelling, and some people have added hardware modifications (bed levelling sensor) for full auto mesh bed levelling.

Stephen Todd

Just come across this video - may help somebody with A5 or version one A3s

Laser8302

Pretty good video!
You'll need a mount. If you don't mind losing the front panel, I went with this one for 0 offset in the X direction:
https://www.thingiverse.com/thing:2831498

The wires that come with the sensor are going to be too short. You'll either have to create an extension or buy one.