Cura 4.4.1 Preview bug or slicing engine bug?

[Build-0-Matic 0]

Hi!

I've just begun 3D printing and I'm already stumbling onto something weird and I don't know if it's a bug in the preview or a bug in the slicer.

Thing is I print my parts at the public library and I rely a lot on the previews. I made a part that contains some holes through the base and they save properly as STL. When I open the file in Cura 4.4.1, it shows as OK. But when I slice (using the only button called slice on the screen) and then preview, it shows the holes as filled and the solid base as empty.

I included my STL file.

 

So the big question is`: Is the file going to print properly like I made it or improperly like on the preview?

 

Thanks

Instax Mini Scan Mask full frame 2x.stl

[IRobertI 521]

Your file is broken. Take a look at it in X-Ray view in Cura and you will see red areas that indicates a problem with the model. You can try running it through an online repair tool like the one from Netfabb and see how that works.

[Build-0-Matic 0]

That's quite annoying. I guess Sketchup failed one more time.

Strange thing is I tried it with Slic3r just for fun and it appears to be able to generate the Gcode without any issues.

 

I wonder if in future versions of Cura there shouldn't be a pop-up warning the user that their file is broken and that it probably won't print correctly?

[IRobertI 521]

You can install a plugin called "Mesh tools" which will give you a heads up. It can also repair some issues (tried it with your file and it didn't work).

 

There are also some Mesh Fixes settings in Cura that you could play around with and see if it helps.

 

What it comes down to is that the file isn't exported correctly (Sketchup is notorious for this) and the slicer takes it's best guess as to how to handle it. In this case Slic3r got lucky and guessed right and Cura didn't.