[Problem with CURA slicing extra layers filling up empty space]

I'm using the last version available on the site, so I don't know if the x-ray is still on this version but it does still shows red areas, although after slicing it now shows somewhere else that there's some internal geometry?

 

I'll try adding some supports to it, I'm testing smaller models now.

PI3_del_test_hp.3mf

[Problem with CURA slicing extra layers filling up empty space]

Pic of the layer 108, where it filled the empty part with the spaghetti.

 

Pic of the layer 381, where it should print a new 'step'; it started printing it from the center so instead of starting from the proper layer it printed in the air, so printing failed.

 

Any ideas why this is happening? This is my first printer and I'm literally an one week user.

[Problem with CURA slicing extra layers filling up empty space]

The tittle says it all. For some reason the slicing process makes additional layers within emtpy space, making some sort of spaghetti 'glitch'. In the first pic, it's another model, in which happened the same but I wasn't present at the moment it happened so I didn't noticed. In the second pic you can see the 'spaghetti glitch' that has been taken out during print; ninja style. 

 

First I thought it was an export/import problem. I couldn't visualize the processing of layers in CURA, I don't know why. but it did showed this filled gap. And in Repetier Host I could find which layers where being filled up with this problem (layers 103~108).

 

I'm attaching the file.

 

Any idea why this is happening? Thanks in advance.