bed map weird

Hey guys, I am running my auto bed mesh on a duet Wifi and it comes up looking like this screen shot.. what could be the issue here?
Ran a test of z probe by running 6 times, and got a variance of .008

The height of the nozzle is varying depending on whether the belt is pulling the print carriage in the +X or -X direction. Perhaps you have a loose bearing that allows the print carriage to tilt slightly when it is pulled one way, and the tilt is reversed when it is pulled the other way.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Thanks for the reply. My belt tensioner for the X axis was not all the way tight (the mounting bolt, not the tension of the X belt itself). I fixed that, and made sure everything else was tight, and I still get some variation.
[www.thingiverse.com]

I am also seeing some large dips on the edge there and the bed is very flat, its one of these.
[uedata.amazon.com]




Thanks for your help!

Edited 1 time(s). Last edit at 03/12/2019 01:29AM by ShreddinPB.

You still have slight ridges and valleys in the X directions, indicating that you haven't completely eliminated the tilting of the print head or whatever else is causing the Z probe height to depend on the direction the the carriage was most recently pulled in.

It also looks like you have a dip in the bed running in the Y direction, unless that is an artefact of your Z probe. What type of Z probe is it?

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Quote
dc42
You still have slight ridges and valleys in the X directions, indicating that you haven't completely eliminated the tilting of the print head or whatever else is causing the Z probe height to depend on the direction the the carriage was most recently pulled in.

It also looks like you have a dip in the bed running in the Y direction, unless that is an artefact of your Z probe. What type of Z probe is it?

Its an official BLTouch, I can run a repeatability on it tonight, but I have run it in this setup and it was very good.
I can try to tighten the X carriage a bit more. I cant get it to budg trying to rotate it with my hands tho.

I am trying to get it running well enough to upgrade to dual MGN12H linear rails for the bed.. and now I think I should add an MGN12h to the X axis also.

So, I tried to run my own repeatability test (I dont think reprap firmware supports M48 )
I just ran this 10 times in a macro

G0 Z10
G30 S-1

Here are the results. Something weird tho, my macro runs that 10 times, but I get a random number of call backs in the console, ran it 4 times here so there should be 40 results, instead I see 2 for the first two runs and 5 for the next two.. something I have set wrong?

I can not get rid of the little ridges in the bed map, I completely disassembled the X and rebuilt.just did not remove the 2020. It is much smaller now, but still there.