Cura slicing adding and erasing features

[Travis12 0]

I'm trying to make what I thought would be a simple object, a house shape pen holder with a simple door and window shaped design. At first the designs stuck out 1mm but when it printed it added lines next to the doors that shouldn't be there. I thought it might fix it if I reduced the design to sticking out 0.5mm and got the opposite problems, features of the design that were supposed to be there disappeared(specifically the right side of the door). It looks fine in normal view but if you go to layer view the errors become apparent. In the photos my first iteration is on the left and the latest iteration on the right. I've tried every single combination of options under the "fix horrible" tab but nothing helps. I'm using Cura version 21.04

[gr5 2,210]

Are you using sketchup for cad?  What you describe are common issues with sketchup.  They are fixable - follow this link below.  Or you can fix them with an STL repair program.

 

https://i.materialise.com/blog/3d-printing-with-sketchup/

[Travis12 0]

I am not using sketchup, I'm using Fusion 360.

 

Would the STL repair program help with STL files from Fusion 360?

[gr5 2,210]

In advanced or expert settings (I forget which )there are 4 settings in the "fix horrible" category.  Uncheck all of those just in case.  Also in cura xray view if you see anything that is red then that's most likely the problem.

 

But I doubt there are any of those types of errors in your model as fusion 360 is pretty good about making manifold STL files.

 

Instead I think that the trim around the door is touching the house but is a separate object and cura thinks it's too small to print and doesn't realize they are supposed to be connected.  You want no surfaces between the trim and the house.  I could be wrong about this.  It could be a bad model.

 

netfabb free repair service is here (you have to create an account though):
https://service.netfabb.com/login.php