Spin the model around its **longest axis**:
- **Vertical (around Y)** — for upright shapes that are taller than they are deep: busts, bottles, columns, trees, chess pieces.
- **Horizontal (around Z, depth)** — for long shapes lying down: fish, aircraft, blades, boats, cars.
The import pop-up auto-suggests one based on the model's bounding box, but you know your part best. If the result looks mushy on one axis, re-import on the other. You can also use the **Rotate part** buttons (X/Y/Z ±90°) in the status panel to stand the model up or lay it down first, then pick the matching axis. More detail: https://cncfoam.com/wiki.php?a=rotating-a-part-start-orientation
- **Vertical (around Y)** — for upright shapes that are taller than they are deep: busts, bottles, columns, trees, chess pieces.
- **Horizontal (around Z, depth)** — for long shapes lying down: fish, aircraft, blades, boats, cars.
The import pop-up auto-suggests one based on the model's bounding box, but you know your part best. If the result looks mushy on one axis, re-import on the other. You can also use the **Rotate part** buttons (X/Y/Z ±90°) in the status panel to stand the model up or lay it down first, then pick the matching axis. More detail: https://cncfoam.com/wiki.php?a=rotating-a-part-start-orientation