Mesh bed leveling  

Re: Mesh bed leveling

This depends on the order in which the metrics are fed into the graph. The lower image is correct.

The more explicit question is whether my interpretation of the lower image is accurate. I.e., this image is telling me that the left rear corner is lower than the rest of the bed, right?

Re: Mesh bed leveling

Yes, that's right.

Re: Mesh bed leveling

If I were a gambler, I might try to keep going and beat the record. I'm just not feeling that lucky.

Re: Mesh bed leveling

Did you notice an improvement in your first layer after leveling the bed?

Re: Mesh bed leveling

Did you notice an improvement in your first layer after leveling the bed?

I didn't get to do a lot of first layer tests after getting the bed level... I still don't have a good first layer, but it *is* more consistent. What I had before the leveling was that the center square was reasonable, the front, back and right squares were marginal and the left square was horrid. Now they're all marginal... so I still have some live Z adjustments in my future.

Re: Mesh bed leveling

Why doesn't Prusa just correct their bed leveling firmware? I doubt the z-axis home is 100% micron repeatable so why won't the auto level do its job 100% ?

Re: Mesh bed leveling

Looks like your X axis is slightly not level.

Go to your printer, (make sure the motors are disabled by clicking Motors Off in Octoprint or selecting Disable Steppers in the menu on the printer) grab your left Z lead screw and turn it clockwise 1 or 2 steps (you will feel it snapping into steps) That will slightly rise the left side of the X axis which will relatively lower the left side of the bed.

Go back to Octoprint and refresh the data in the Bed Visualizer. Observe what changed and repeat until you see the bed in Bed Visualizer skewing the other way.

I have a similar issue as the OP, and managed to get from a variance of around 0.45 mm to less than 0.1 mm. My problem is that for some reason after a short while I run the test again, and it's back to around 0.45 mm. What am I missing? Thanks in advance.

Re: Mesh bed leveling

Well temperature plays a big part - at least in my case. So leave the bed heated to the desired print temperature for a good 15 minutes before running the bed level check. I am seeing a variance less than 0.1mm, but still I get variable first layer print quality.....
Texy

Re: Mesh bed leveling

Where are these heatmap images showing up from? Is it when you have your MK3 connected to your computer over USB and this is from Slic3r? So far I've only connected over USB for firmware updates and then disconnect. All file transfers from Slic3r have been using a thumb drive.

Re: Mesh bed leveling

Where are these heatmap images showing up from? Is it when you have your MK3 connected to your computer over USB and this is from Slic3r? So far I've only connected over USB for firmware updates and then disconnect. All file transfers from Slic3r have been using a thumb drive.

We are using Octoprint in most cases, which runs on a Raspberry Pi to run your printer. There's a plugin for it that does these heatmaps.

Re: Mesh bed leveling

Don't want to disrupt the thread, but is there anything like this for stock Mk3 printers? It would be nice to know the bed is level.

Re: Mesh bed leveling

Just install Octoprint on a Raspberry Pi, connect MK3 via the USB port.
Then install "Prusa mesh Leveling" from the "Plugin Manager" menu (it's free). Do not use "Bed Visualizer" because it gives a false image of the bed.

Re: Mesh bed leveling

Don't want to disrupt the thread, but is there anything like this for stock Mk3 printers? It would be nice to know the bed is level.

Yes, you can do it with a stock Mk3 printers and a USB cable.

Send the following commands with the USB interface using Pronterface or S3D ...

G28 W
G80
G81
( Watch out capitalization counts, first time I tried it I use lowercase “g” and that did not work )

Then copy the G81 results into Excel or other visualizer.

http://lokspace.eu/3d-printer-auto-bed-leveling-mesh-visualizer/

Watch out the lokspace visualizer is a bit of a mirror image. So place a piece of paper under a corner or two to get your orientation. But I do like lokspace and it ignores text so you do not need to delete the read comments when copying.

No Octoprint or Raspberry Pi required. Hope this helps.

Re: Mesh bed leveling

Thanks John, exactly what I was looking for.

RE: Mesh bed leveling

Hi, new here, Mk3S. Just trying to level the bed with the octoprint plugin, the results are the worst I think, what can I do? thanks

btw, is the z live adjustement anything to do with this? I had to put it on -940.0