Missing Layers in my 3d model after slicing

[dtanov 0]

I have been banging my head for ages but I can't figure out what I'm doing wrong! I am missing like 20 layers after slicing and I have no idea why? Any help at all please! I'm attaching the STL file.

6.stl

[GregValiant 1,115]

When Cura paints polka-dots on a model it's because there are errors in the model.

Your model is on the left and the repaired model is on the right.

 

Here they are sliced.

 

If you are using Windows you can get MS 3D Builder from the Microsoft store.  It's not very intuitive, but it's pretty good at repair and at altering STL and other model files.