Why is layers 3D model messy when scale?

When scaling a layered 3D model, messiness usually stems from unlinked (unparented/ungrouped) layers or misaligned pivot/origin points—these break relative positioning as size changes. Unlinked layers move independently instead of staying connected, so scaling pulls them out of their original arrangement. Misaligned pivots (if each layer’s center isn’t set to a shared reference, like the model’s center) also cause shifting. To fix this, group all layers to a single parent object first and align their pivot points to a common origin before scaling.