Z-lift is automatic??????

Z-lift is automatic??????

Postby Tinchus2009 » 14 Jul 2018, 18:18

Hi. New kisslicer user here. Im starting some prints to learn the use of kisslicer. Today I observed one print, executeing z-lifts... But I didnt set that. I checked in the material tab and z-lift is set to cero. But the actual prints is showing z-lifts. I have adaptative layer activated, is z-lift somehow automatic too?

I have atached the stl model, the project file and the generated gcode file.
I hope someone can give me hint of what is going on.
Thanks in advance
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z-lift.zip
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Re: Z-lift is automatic??????

Postby pjr » 15 Jul 2018, 04:48

Yes, there is a small Z-lift in your G-code files, but only when printing support and support interfaces.

I don't know why this is the case, but I would assume that because supports are quite delicate, the Z-lift is there to prevent them from being knocked over.

That being said, I am not convinced by my assumption, and I will get it checked out...

Peter

EDIT: Just looked a little further and it's not only on support paths.
Please note: I do not have any affiliation with KISSlicer. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss.
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Re: Z-lift is automatic??????

Postby FredFromParis » 29 Mar 2019, 08:21

Hi everyone,

Any news about this automatic Z lift ?

Since v1.6.x, there is some Z lift even if this parameter is set to 0.

It seems to get bigger during printing as Z is increasing...

TIA,
Best,

Fred
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Re: Z-lift is automatic??????

Postby pjr » 29 Mar 2019, 08:41

FredFromParis wrote:Hi everyone,

Any news about this automatic Z lift ?

Since v1.6.x, there is some Z lift even if this parameter is set to 0.

It seems to get bigger during printing as Z is increasing...

TIA,
Best,

Fred


Please zip up and upload sample (small) G-code where this is happening.

Peter
Please note: I do not have any affiliation with KISSlicer. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss.
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Re: Z-lift is automatic??????

Postby FredFromParis » 29 Mar 2019, 09:32

Here it is...

Thanks for checking.

Best regards,
Fred
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CylindreH180R40Z045.zip
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Re: Z-lift is automatic??????

Postby pjr » 29 Mar 2019, 14:19

FredFromParis wrote:Here it is...


Yeah, it's not so much a lift as a gradual incline when moving from the end of one path to the start of the next.

Code: Select all
G1 X156.935 Y140.243 E15.11278
; Perimeter Length = 252.607880
; 'Perimeter Path', 0.3 [feed mm/s], 18.0 [head mm/s]
G1 X156.764 Y140.247 Z2.0686 E15.11278 F6000
G1 X156.764 Y140.247 Z2.0593 E15.11278 F360


And again, you have a material shrinkage factor. I wondering whether removing the Z shrinkage on the Material tab would resolve the problem?

Actually, I don't know whether this is by design or a fault. The lift is extremely small at the start, but increases during the print; it does seem to equate to you 0.45% shrinkage value.

Peter
Please note: I do not have any affiliation with KISSlicer. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss.
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Re: Z-lift is automatic??????

Postby pjr » 29 Mar 2019, 17:25

FredFromParis wrote:Here it is...


Update: This is a fault and it is now on the fault report list.

Peter
Please note: I do not have any affiliation with KISSlicer. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss.
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Re: Z-lift is automatic??????

Postby FredFromParis » 01 Apr 2019, 08:18

Hi Peter,

Thank you for having checked.

That is what I thought... But it's always better to check with other people.

If Z shrink = 0, then there is no unexpected Z lift anymore... That's the only solution I found to avoid this behavior.

Best regards,
Fred
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