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Z-Axis Dimension Calibration?  

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Yangorang
(@yangorang)
Active Member
Z-Axis Dimension Calibration?

I just bought a Prusa Mk3s+ and it's been working great for me.  The only thing I noticed is that when printing a 20mm calibration cube it always seems to be exactly 0.2mm larger in the Z direction.  X and Y dimensions are spot on.  Is there anything on the hardware that I should troubleshoot?  Or is there anything in the Slicer that I can do to compensate?

I guess another thing on my to-try list is to check objects of other dimensions to determine whether this is an offset or a scaling.  i.e. I'm not sure at this point if it were a 30mm cube whether it would be off by 0.3mm or if it would still just be the same 0.2mm.

Posted : 01/08/2021 2:01 am
Dan Rogers
(@dan-rogers)
Noble Member
What layer height are you slicing it at?

Different layer height selections will give you different Z outcomes - due to math.  What layer height are you experiencing this with?  Did you put a raft under your part?

Posted : 01/08/2021 2:41 pm
Yangorang
(@yangorang)
Active Member
Topic starter answered:
Z-Axis Dimension Calibration?

I'm using the 0.2mm quality profile with no raft so my understanding is that I should be able to hit pretty much spot on the 30mm cube target?

Support suggested I may be experiencing some over-extrusion and I should try to perform the extruder calibration procedure.  I have not gotten around to buying a micrometer for that yet, but my Mitutoyo calipers with .xx mm accuracy shows it to be spot on.  I am using the Prusament spool which came with the printer and as I understand that should not need changing the extrusion multiplier.

I still need to try printing a bunch of objects of different sizes to see what happens.

Posted : 16/08/2021 6:17 am
Ringarn67
(@ringarn67)
Reputable Member
RE: First Layer?

@yangorang

How is your first layer?
If first layer prints 0,2mm too high everything will be about 0,2mm higher...

Prusa i3 MK3S+ FW 3.10.0.4481 (kit dec -20), PrusaSlicer 2.3.3+win64, Fusion 360, Windows 10...
Posted : 16/08/2021 10:37 am
Yangorang
(@yangorang)
Active Member
Topic starter answered:
First Layer Calibration / Benchy Bottom

I was actually just fine-tuning that and have pictures in another thread - I did end up lowering everything a tiny bit, but it was an adjustment of less than 0.1mm.

https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/first-layer-calibration-benchy-bottom/#post-487399

Posted : 16/08/2021 2:51 pm
Ringarn67
(@ringarn67)
Reputable Member

Measure the thickness of your first layer? 

Print a few test pieces, 0.4, 1, 2, 5 thick etc, and measure them

That will determine where errors begin

Prusa i3 MK3S+ FW 3.10.0.4481 (kit dec -20), PrusaSlicer 2.3.3+win64, Fusion 360, Windows 10...
Posted : 16/08/2021 4:30 pm
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