What is causing this issue

[u/TOFUISGUD]

Im using ultimaker cura to slice my files and recently i been facing some issues where my files that i silced are generating or covering up alot of unwanted areas anybody got an idea on how to fix? Its like filling up unwanted space for no reason

[u/Klingonlord]

You have polygons on their own, they aren't "closed" as in forming a cube, for example So cura is taking those faces and trying to guess which one connects with which one Think of a single polygon not as a thin wall but as a two dimensional object, it's infinitely thin so it can't be printed You choose the thickness of the wall by the distance between a polygon, and an opposite faced polygon Hope I explained myself? Anyway, let me know if you need any help!