Surface Mode Spiralize - Random direction change

[summerso 0]

Hi, 

 

i'm trying to print a non manifold surface model in surface mode (smooth spiralize) however i have notice that on a few different layers near the top the spiral direction changes, and on other layers near this section the printer moves to a completely random seem point that doesn't line up with anything. this is causing me to have about a 10 layer section that is full of over/under extrusion causing slight holes and imperfections on an otherwise perfect print. 

 

I have tried many different settings and read many threads to get to this point, however I cant find anything on why this happens. 

I have also tried re modeling the object making sure that the normal vectors  are all consistent and I am still getting this issue.

I have also tried manually setting z seem and wall optimizing and wall flow and many others.

 

I have attached the project file bellow. If you would like to take a look. Problem layer are 9-37 layers from the top (I have the model pulled down to reduce slice time around the problem area)

 

to clarify, this issue was far worse before but I have spend a considerable amount of time trying to perfect this print. I just cant get this last bit. any help would be appreciated!

 

 

Lamp Shade 3.25.3mf

[burtoogle 475]

Hello @summerso, welcome to this forum. The file you provided isn't actually a project file, it only contains the model and not your settings. You need to do File -> Save, not File -> Export to create a project file (I know it's confusing, they like it that way!)

 

Anyway, I sliced your model using my Cura variant and I think it looks OK, there's no weirdness near the top and almost 0 travel moves in the whole file. Mind you, my Cura works somewhat differently to UM Cura so I can't guarantee that you will get the same results using UM Cura. If you wish to try mine, you can find the releases at https://www.dropbox.com/sh/s43vqzmi4d2bqe2/AAADdYdSu9iwcKa0Knqgurm4a?dl=0. Please read the README.md file before installing and using.

 

[summerso 0]

Thanks for getting back so soon @burtoogle,

 

Here is a photo of what my slice looks like, you can see the weird travels

 

I have downloaded your version from your dropbox and it gives me a different issue with artifacts lower down...

 

I have also re attached a saved (not exported) version of the project file. Lamp Shade 3.25.3mf

[burtoogle 475]

Thanks for the new file. I sliced that and can see that weird section but if you put surface mode back to normal then it comes out better. There's still an odd flat section but at least there's less weirdness. Hope this helps!

 

[summerso 0]

unfortunately that doesn't help much, I need that gap in the print to key with another part. 😕 

[burtoogle 475]

Spiralize isn't right for a model with gaps.

 

Why don't you just cut it out later?

[summerso 0]

That's what I did for the first attempt, but there is a high chance that the part will crack because the walls are so thin. So I was trying to see if there was a way to print with the gap in it.