Hello!I created a model for 3D printing in 3DsMax 2019. When I use STL check modifier it says there are no errors. When I export file from .max to .stl suddenly open edges appear.How to avoid that? Am I using wrong settings for export?Model was created using Boolean and then converted to Poly. Can that be an issue?
max.jpg
.max screenshot
stl.jpg
.stl screenshot

Please help me finish my college project)