Strange lines mid-print from finished model when printing one-at-a-time

[Noga 0]

I am using freshly-downloaded Cura 3.4.1.
Trying to slice the 31-day spiral pillbox by LoboCNC (https://www.thingiverse.com/thing:2533058/files), printing one at a time on an Anet A8.

In layer view, on layer 585 (which is one of the layers in the third and final part) I see some really strange lines being drawn from the first part printed to the origin (0,0).
Then on the next layer they disappear?? Only to reappear at layer 601 after all the parts are finished. They are the only thing to happen in layer 601, but for some reason the print says it has 864 layers, although NOTHING gets printed after layer 601.

As I drag the layer view, the lines spontaneously disappear and reappear.
They're highlighted in all sorts of different line types- some are helpers, some are travel, some are inner wall or infill or shell.

What the heck is going on?

(Images attached show the lines, also show that absolutely nothing changes between layers 601 and 826).

[burtoogle 513]

Hello, it would help greatly if you could attach your project (.curaproject.3mf) file. Thanks.

[kmanstudios 1,120]

1 hour ago, smartavionics said:

Hello, it would help greatly if you could attach your project (.curaproject.3mf) file. Thanks.

It really does make a difference to see how it is in all factors as the '.curaproject.3mf' file saves all functions and settings for your printer.

[Noga 0]

Well, this is embarrassing.

My computer crashed and when it turned on again, and I sliced the models again, the problem was just gone.
Here is the file I just now sliced- it doesn't have that problem, but everything else is about the same.

Thanks anyway for your will to help!
?

CFDMP_spiralbox2.3mf

[burtoogle 513]

Hi @Noga, glad to hear that it is OK again. BTW, that file you attached is not a project file. You need to save project (on file menu).

[kmanstudios 1,120]

1 hour ago, Noga said:

Well, this is embarrassing.

Should not be. I cannot tell you how many times a reboot has solved an issue or two. Usually one of my first lines of checks.

[Noga 0]

Well, it's happened again, on a different computer. This time I saved the project file.
Closing and reopening doesn't seem to solve it- when I slice the models again, the weird lines are still there and there are still way more layers than there should be.
I'll just print it all at once, but I should probably report this as a bug, right?
Thanks in advanced

CFDMP_spiralslider.curaproject.3mf.curaproject.3mf.curaproject.3mf

[burtoogle 513]

Hi @Noga, it looks like it is a bug in the layer view, I see those weird lines too. When I save the gcode and look in another gcode viewer I cannot see those lines. There is still a possible problem with your end gcode because you have G28 X0 Y0 which in the gcode viewer I used shows the nozzle being returned to the left hand front corner straight through the large printed part! Hope this helps.

[kmanstudios 1,120]

I am not on the version you are on. Try going back a version because this is what I got and it seems to be what you are looking for.

 

If that has solved it, then it is a bug.

 

Or, what @smartavionics said.....he is much more knowledgeable than I.

Edited July 21, 2018 by kmanstudios