Auto Leveling

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By BEEVERYCREATIVE and Hello 3D Printing World
rkramedjian
Posts: 10
Joined: 07 Jun 2017, 22:46

Auto Leveling

Post by rkramedjian » 11 Jul 2017, 21:20

Has anyone implemented the auto leveling capability. Is there documentation for it anywhere? What did you have to do to get it to work?

Ron

MrDoom
Posts: 223
Joined: 01 Apr 2017, 10:01

Re: Auto Leveling

Post by MrDoom » 12 Jul 2017, 10:08

I have "implemented it", connected the sensor just to test how it works but never used it, but there is no documentation for the helloBEEprusa as far as I know, search for marlin autolevel tutorials and the process should be pretty much the same, you just need to find a way to attach the sensor to the extruders and set the offset on the firmware
:)

rkramedjian
Posts: 10
Joined: 07 Jun 2017, 22:46

Re: Auto Leveling

Post by rkramedjian » 17 Jul 2017, 23:35

How did you go about connecting the sensor?

Ron

MrDoom
Posts: 223
Joined: 01 Apr 2017, 10:01

Re: Auto Leveling

Post by MrDoom » 18 Jul 2017, 11:38

Hello,

The connection I did is something like this, where it says 0-12v and 12v it should be 24v:
http://1.bp.blogspot.com/-6VcowyDvQmI/V ... g%2B2.jpeg

This should work but you could also use an optocoupler to completely isolate the board that works at 5v from the 24v at which the sensor operates like this:

https://i.stack.imgur.com/N1UHV.png

HALFORD
Posts: 127
Joined: 26 Aug 2015, 12:19
Location: MANSFIELD, ENGLAND

Re: Auto Leveling

Post by HALFORD » 21 Jul 2017, 21:48

Hello, I have been experimenting with this with reasonable success
The sensor i have is inductive type. You can find it here; https://www.aliexpress.com/item/DC-5-24 ... 18916.html

The problem i had was were to mount the sensor. The X axis was my first choice after looking at other variants people have used.
This leads to many problems in the marlin config as there is not enough stroke in the X axis minus direction for the endstop position.

Currently working on a new setup using the Y axis and the cooling fan. Testing ongoing.
Although this is more common now on other printers as standard or upgrades it can lead to more problems.

The wiring is straight forward; Blue= -5V Brown=+5V and Black= sense in Z when the switch is triggered.
Use the 5v power supply from the board and connect the black wire to the Z axis endstop; after disconnecting the existing switch.

Warning! fully test the electrical side is sensing BEFORE fitting the sensor. The first one i brought did not work at all the led was permantley on.

More info here; https://www.youtube.com/watch?v=EcGFLwj0pnA
http://youtube.com/watch?v=wih4fNkKUCc

I will also post my marlin config once testing is complete along with ALL instructions.
Look on youtube for more info.

Hope this helps for now.

Halford

MrDoom
Posts: 223
Joined: 01 Apr 2017, 10:01

Re: Auto Leveling

Post by MrDoom » 24 Jul 2017, 15:30

Hi Halford,

Inductive sensors should only be used on solid metal bed not on glass/PCB like the helloBEEprusa, I've seen a video, about that on youtube, they even tried adding some foils of aluminum bellow the glass ended up having a very bad repeatability and changes of 5% humidity changed the trigger distance a lot as well, that could be worsening your results.

I would guess that between the extruder stepper motors would be a good place to put the sensor and probe pretty much the whole bed :)

Do you have any videos of the system working?

HALFORD
Posts: 127
Joined: 26 Aug 2015, 12:19
Location: MANSFIELD, ENGLAND

Re: Auto Leveling

Post by HALFORD » 01 Aug 2017, 21:02

Hello, Here is the link to the video showing the working Auto Bed Leveling.

https://drive.google.com/open?id=0B0RFS ... UhiemZkVDQ

Comments please :)

MrDoom
Posts: 223
Joined: 01 Apr 2017, 10:01

Re: Auto Leveling

Post by MrDoom » 03 Aug 2017, 11:09

Very nice work Halford, how good is the repeatability of the leveling? I am working on a system with a microswitch and a servo if that's good I might go that way because its simpler to just buy a new sensor :)

I find the position of the sensor a little weird, won't that block most of the air from the cooling fan?

HALFORD
Posts: 127
Joined: 26 Aug 2015, 12:19
Location: MANSFIELD, ENGLAND

Re: Auto Leveling

Post by HALFORD » 04 Aug 2017, 17:57

No not at all, intact the flow will be greater due to smaller passage. No noticeable difference. The reason why the sensor is located here maximise that X axis travel. So far after leveling the bed the accuracy is no more than 0.20m flatness. Only one bad corner which is low on warped bed. Repeatable to within 0.05 so far. Will record the bed leveling results and post soon. Very pleased with it so far. :)

HALFORD
Posts: 127
Joined: 26 Aug 2015, 12:19
Location: MANSFIELD, ENGLAND

Re: Auto Leveling

Post by HALFORD » 04 Aug 2017, 17:59

Servo system needs slot of extra work all round.

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