End piece of first layer calibration looks odd after MK3 to MK3S. Belt Tensioning issue?
 
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End piece of first layer calibration looks odd after MK3 to MK3S. Belt Tensioning issue?  

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Sam
 Sam
(@sam)
Eminent Member
End piece of first layer calibration looks odd after MK3 to MK3S. Belt Tensioning issue?

Some time ago I upgraded my MK3 to MK3S and noticed that my first layer calibration does not look good (not for the Z height, but for the X axis). Overall I experienced that my prints became worse after the upgrade. (I do not blame Prusa or MK3S, I simply assume that I re-assembled something worse than I did before 🙂 )

Now unfortunately I did not start gathering the first layer calibration pieces from my previous steps that's why I cannot compare the results.

Attached is a first layer calibration piece. Notice that the surface is not smooth but again I can't remember whether the first ones looked the same.

What disturbs me more is the imprecision on the left edges. Now during a print there will be a perimeter there that might obscure or remove this pattern but I asked myself whether this is a sign of something that I did not assemble very well. I am aware that this is not a X/Y calibration model, I am just curious whether first layer cal looks similar for all of us.

Any hints on that are appreciated 🙂

Attachment removed
Napsal : 07/07/2019 9:22 am
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(@)
Illustrious Member
RE: End piece of first layer calibration looks odd after MK3 to MK3S. Belt Tensioning issue?

Looks like over extrusion (Live-Z a bit low).  And, the left side jaggedness indicate that part of the bed has a fingerprint.

Napsal : 08/07/2019 6:14 am
Peter M
(@peter-m)
Noble Member
RE: End piece of first layer calibration looks odd after MK3 to MK3S. Belt Tensioning issue?

Oils on rail etc, maintenance?

Do a calibration of z-axis

Pid calibration with 210 temp.

 

Clean bed. This is very important for a 3d printer!!!!

z-layer a little higher, and try again, and higher again en test again,  this is also very important!!!, try higher or lower, different filament.

 

Napsal : 08/07/2019 11:18 am
pierrealain_dedome
(@pad31)
New Member
RE: End piece of first layer calibration looks odd after MK3 to MK3S. Belt Tensioning issue?

Hello

I had the same issue after updating to last firmware version whereas it was fine on previous version.

I 've started to set the Z higher which did not help a lot,  then dissemblable my bed and I finally set the value I had before updating the firmware

With this value  the first layer of my Prints are perfect whereas the end piece of the calibration is like yours. 

It may be a "bug" on the Z calibration introduce by last firmware , hope the support will investigate

Napsal : 09/07/2019 1:07 pm
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