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Z-offset plugin -- can't take a negative value

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Posted · Z-offset plugin -- can't take a negative value

LOVE the Z-offset plugin by fieldofview. The idea of having the Z-offset set by the profile instead of me trying to remember to do it when switching filaments just tickles me.

 

But... it can't seem to take a negative number. Cura (3.6) gives a error that it is unable slice "due to some per-model settings".

 

My Z-axis homes with a BL-Touch, I believe which is why I need to use a negative value, since it's homing from above the bed instead of below. I might be wrong.

 

Full disclosure, I am using an Ender 3 and not an Ultimaker. Hope this doesn't get me thrown off the forum. But this is where I saw that fieldofview hangs out.

 

Thanks.

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Posted · Z-offset plugin -- can't take a negative value

Never mind. I found an adjustable mount for the BL-Touch so I can lower it enough that my Z-offset becomes zero for PLA and a positive number for PETG.

 

Sorry to bother.

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Posted · Z-offset plugin -- can't take a negative value

The minimum value for the Z-Offset is the negative of the Initial Layer Height. If the Initial Layer Height is 0.3mm, you should be able to enter -0.3 as the Z Offset.

 

Specifying a value lower than (- Initial Layer Height) would result in a negative Z value in the gcode. The firmware would - at best - ignore the negative value, or give you an error. The firmware assumes that Z=0 means that the nozzle touches the buildplate. A negative Z would mean that the nozzle is below the top surface of the buildplate (ie: the nozzle pushes through the buildplate). Needless to say, the nozzle actually pushing through the buildplate would be "less than desirable".

 

PS: fieldOfView is known as @ahoeben on this forum.

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Posted · Z-offset plugin -- can't take a negative value

PS: you are more than welcome here. No need to apologise (for your printer or your question)

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