Z-Seam location is confusing me!

[ssashton 2]

Hi,

 

I don't seem to get the Z seam where I expect it.

 

I printed this part with (IIRC):

 

Z Seam Alignment: User Specified

Z Seam Position: Back

Seam Corner Preference: None

 

Yet the seam on the back starts wondering to the side then goes back to the middle, then goes away for ages to the inside wall then comes back... no consistency.

 

(Edit: Google Photos seems to have clearer images: https://photos.app.goo.gl/DpuhRyDTaXzMHnPU9 )

 

Back wall:

 

Inside wall:

 

 

I printed again with settings (IIRC):

 

Z Seam Alignment: User Specified

Z Seam Position: Back

Seam Corner Preference: Hide Seam

 

Now it seems to be all over the place including the front of the object! 

 

Back Wall:

 

Front Wall:

 

 

I'd appreciate some help both with how to set the Z seam so it is consistently at the back centre of the model and also how to spot the Z seam position in the preview window.

 

This is what I see for example and I don't recognise the seam location.

 

Thank you!

Edited July 8, 2020 by ssashton

[Smithy 1,145]

5 minutes ago, ssashton said:

This is what I see for example and I don't recognise the seam location.

It helps if you turn on Coasting temporarily to see the location of the seam.

 

For your other questions, let's wait for the Cura experts here....

[burtoogle 515]

This is relevant...

 

https://github.com/Ultimaker/Cura/issues/8010

 

[ssashton 2]

33 minutes ago, Smithy said:

It helps if you turn on Coasting temporarily to see the location of the seam.

 

Thank you that's a great tip!

[ssashton 2]

I found that if I play with rotating the model as well as trying a few 'Z Seam Position' options I was able to make it put the seam always on a sharp corner. Not a global solution but another tool in the box.

 

I had always put rectangular objects parallel to the axis with the assumption it would print more perfectly square, but I might change that behaviour now!