The loft feature of Fusion360 creates a lot of problems for Simplify3D. Here's an example of a missing wall: https://i.ibb.co/w7421WP/sliced.png The wall is there and is 2mm thick: https://i.ibb.co/WBWF6Dd/model1.png https://i.ibb.co/4NNqH1f/model2.png Best STL Viewer: https://i.ibb.co/s6wzrRn/bests...