Cura slicing a solid

[saline 0]

I've got a shell with a deep pocket.  Towards the open end, I have a ridge running around the inside of the shell.

 

When I look at the stl file in the Prepare view it is fine.

When I slice it, it's solid to the ridge.

 

Drill Holder - Upper.stl CE3E3V2_Drill Holder - Upper.gcode

[mrender 25]

You've got some strange things going on in the corners of the stl which is probably causing this to slice the way it does.

Section of a corner attached.

[GregValiant 1,261]

The original is on the left.  The one on the right was repaired with MS 3D Builder.

[saline 0]

On 7/27/2023 at 11:09 AM, mrender said:

You've got some strange things going on in the corners of the stl which is probably causing this to slice the way it does.

Section of a corner attached.

The problem was that the fillet was 1mm and the ledge was 1.5mm.  The ledges ran into each other and Cura had a problem with that.  Changed the fillet radius to 1.5mm to match the ledge, and Bob's your uncle.