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First layer wizard not adjusting  

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Technolio
(@technolio)
Active Member
First layer wizard not adjusting

Just finished assembling my new MK3s and got to the calibration step of the live z adjust, for whatever reason it doesn't budge while adjusting, I got all the way to -0.3 and there was no discernable difference. I can manually adjust the z just fine from the settings menu however. Anything that could cause this?

Best Answer by --:

A misread ... the manual is pretty clear there is a nominal range, but if you hit -2.000 you need to adjust the PINDA.  I've been between -0.600 and -1.100 as I changed nozzles ... and generally, once set, you should not have to adjust Z-Offset unless you make a mechanical change to the printer, reset it, etc.   

Observe the line which is being extruded on the print surface. A new menu will automatically show up where you can tune the nozzle height in real time by turning the knob. The aim is to adjust the nozzle height until the extruded plastic sticks nicely to the bed and you can see that it is being slightly squished. The value should not exceed -2.000 mm. If you have to adjust it more (e.g. -2.500), move the P.I.N.D.A probe slightly higher. Please refer to our knowledge base in case the P.I.N.D.A probe needs to be re-aligned.

Posted : 05/06/2019 1:59 am
Peter M
(@peter-m)
Noble Member
RE: First layer wizard not adjusting

Mine is -0.8.

Did you look at the space between nozzle and bed, and if it gets smaller?

How does your test look like.

Posted : 05/06/2019 4:49 pm
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(@)
Illustrious Member
RE: First layer wizard not adjusting

You will not see a 0.1 mm change in extruder height.  Our eyes just aren't that good.

The typical distance you have to adjust is around -0.800 mm.   

The PINDA is set to about 1.2 mm using the cable tie thickness. The PINDA senses metal at about 2.0 mm.  Thus 0.8 difference.

When adjusting Z-offset the first time, you'll need to make adjustments in -0.100 mm steps until you see the extrudate start to squish.  Then start stepping in -0.050 steps. 

A larger test patch is the recommended way to set Z-offset.  Something like this image: because it allows time to make adjustments and see what the effect is.

Here's the Cal Circle to slice and try ...

Cal Circle

This post was modified 5 years ago 2 times by --
Posted : 05/06/2019 5:02 pm
Technolio
(@technolio)
Active Member
Topic starter answered:
RE: First layer wizard not adjusting

Okay, I will have to double check. I thought the manual said if you have to adjust it further than -0.2 that you should reposition the probe. 

Posted : 05/06/2019 7:48 pm
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 --
(@)
Illustrious Member
RE: First layer wizard not adjusting

A misread ... the manual is pretty clear there is a nominal range, but if you hit -2.000 you need to adjust the PINDA.  I've been between -0.600 and -1.100 as I changed nozzles ... and generally, once set, you should not have to adjust Z-Offset unless you make a mechanical change to the printer, reset it, etc.   

Observe the line which is being extruded on the print surface. A new menu will automatically show up where you can tune the nozzle height in real time by turning the knob. The aim is to adjust the nozzle height until the extruded plastic sticks nicely to the bed and you can see that it is being slightly squished. The value should not exceed -2.000 mm. If you have to adjust it more (e.g. -2.500), move the P.I.N.D.A probe slightly higher. Please refer to our knowledge base in case the P.I.N.D.A probe needs to be re-aligned.

Posted : 05/06/2019 8:18 pm
Technolio
(@technolio)
Active Member
Topic starter answered:
RE: First layer wizard not adjusting

Your right! I'm just an idiot lol, had to adjust it way more than I thought. It looked perfect at around -0.6

Posted : 06/06/2019 1:22 am
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(@)
Illustrious Member
RE: First layer wizard not adjusting

Idiot is relative ... 

Once you get settled, there are a few things that help Z-Level consistency:  7x7 mesh cal; and M860 S35 ... incrementally better with each. 

Posted : 06/06/2019 5:11 am
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