MK3.5 Compatible with Octoprint Prusa Leveling Guide  

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

Posted by: @matze-3

Hello Printers,
I want to upgrade my MK3S+ to MK3.5
I for the Bed Leveling on my MK3s+ I use Octoprint and the Prusa Bed Leveling Plugin. This is working fine.
My question, so any of you already have experience with the plugin in conjunction with the MK3.5? Is it working?

I used to have the mod installed and it helped alot, but when i went to 3.5 i decided to replace it with the spring metal spacers these helped more then the nylock mod and you dont need octoprint to painstaiking turn scres little bits at a time. If i wss you id replace it with the metal spacers they provide.

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

I have replaced the nylon lock mod with these metal spacers while updating to 3.5 and I am very disappointed. As soon as I will found a working solution for  the plugin on a MK 3.5, I will jump back and do a  proper leveling.

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

this means the Plugin is at the moment not working with MK3.5?

RE:

It seems to be work in progress.  Best resource I found was:

https://github.com/bbbenji/PMSBLM/issues/28#issuecomment-2059300568

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

The project was updated. It also does its job for my MK3.5 with FW 6.01.

https://bbbenji.github.io/PMSBLM/

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

So the self-locking nuts are still the best solution? I used the new original spacers for the upgrade, but the result is not optimal with large prints.

tonitom

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

I'm in the process of upgrading my MK3 machines, and the new bed spacers make the bed much worse (for me).  I went back to the nyloc mod, and used pronterface to help level it.  It's pretty easy once you know how.  When connected to Pronterface, you run a G28 (to home) and then G 29 (bed mesh).  As it's running the mesh, you write down the values when it is over one of the screws (first, fourth, and seventh homing position on the first, fourth, and seventh row).  Adjust to get them as even as possible.  You'll also get to see the numbers for all 49 points, to let you know how much warp is in your bed, which the probe will account for, but you won't be able to adjust.

Overall my 3.5 upgrade experience has not been great, I have more failures and print issues than before.  I'm going to do some more extensive testing and see if I can dial that out, but it's disappointing, since the machines were printing fine before the upgrade.  I run my machines fast, and was getting ringing, and while this has eliminated that for the most part, the added problems are making me regret my decision.  Hopefully this is temporary.

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

I'm waiting until this bug is resolved [BFW-5606] [BUG] MK3.5 Pinda outside of steel sheet when performing MBL before I will spend more time to level my bed.

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

Hi, have install now the new Version on my MK3.5 but for me it looks like the Bug [BFW-5606] is not fixed.
does anyone else feel the same way?

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

I haven't noticed the bug yet. I'm currently using 6.2.0-alpha2. But I use a Bondtech LGX Shortcut Extruder.

I've spent a few hours trying to level the bed with the nylock mod. I used this site: https://bbbenji.github.io/PMSBLM/

However, I can't get a value that's better than 0.22mm between the highest and lowest point. I think it would be better to only use an area of ​​3x3 measuring points to set the screws correctly.But since I don't know enough about it, I'll probably remove the Nylock mod.

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

Thats the best i could get. The low points are between the screws... very weird

RE: MK3.5 Compatible with Octoprint Prusa Leveling Guide

After a lot of testing, I'm now one step further. I've now managed to get a clean first layer on the entire print bed.

I did the following:

If you mainly use PLA, warm up the extruder and heatbed to 170c/60c. Wait 1-2 minutes to avoid temperature fluctuations. (This should be done after each adjustment to get correct measurement results)

Use Terminal of Octoprint or Pronterface:

Send "G28" (Homing)

Send "G29 P1" (Meshbed leveling 7x7)

Send "G29 T" (Get the meshbed results)

Now we got a list of data. Copy this into a text editor. This should look like this:

Now we take 3x3 measuring points from the list. (See picture)

Insert the 9 values ​​into this list:

         0       1       2

2 | -0.045  -0.044  -0.028

  |

1 | -0.033  -0.048 -0.028

  |

0 | -0.033  -0.040  -0.048

        0       1       2

Now just insert the small list on this website: https://bbbenji.github.io/PMSBLM/

There you can now see how the screws of the nylock mod must be adjusted.

Now repeat this process until you achieve a maximum difference of approx. 0.035mm or better.

The first layer must then be recalibrated.

I then recommend printing this to check: https://www.printables.com/model/36706-bed-level-test

Cheers 🙂