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Z-lift is automatic??????

PostPosted: 14 Jul 2018, 18:18
by Tinchus2009
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

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

PostPosted: 15 Jul 2018, 04:48
by pjr
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.

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

PostPosted: 29 Mar 2019, 08:21
by FredFromParis
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

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

PostPosted: 29 Mar 2019, 08:41
by pjr
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

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

PostPosted: 29 Mar 2019, 09:32
by FredFromParis
Here it is...

Thanks for checking.

Best regards,
Fred

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

PostPosted: 29 Mar 2019, 14:19
by pjr
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

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

PostPosted: 29 Mar 2019, 17:25
by pjr
FredFromParis wrote:Here it is...


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

Peter

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

PostPosted: 01 Apr 2019, 08:18
by FredFromParis
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