# Reading the report

## Size

The size in X, Y and Z is the model's bounding box in millimetres. STL files don't store units; like most slicers, the tool reads them as millimetres. If a model is under 5 mm across, the tool warns you: it was probably exported in inches or metres.

## Volume and surface area

**Volume** (cm³) is the space the mesh encloses. It's exact for a closed mesh. **Surface area** (cm²) is the total area of every triangle.

## Weight

- **100% solid**: volume × 1.24 g/cm³ (PLA).
- **At your infill**: about 0.8 mm under the surface is counted as solid walls, and the rest is filled at the infill you enter.

Your slicer's number will differ a little: supports, brims, top and bottom layers and line widths all change the real weight. Use the slicer's weight for final prices.

## The hole check

Every edge of a closed (watertight) mesh is shared by exactly two triangles. The check counts edges used by only one triangle (gaps) and by more than two (overlapping parts).

- **No holes found**: the volume and weight are reliable.
- **Possible holes**: repair the mesh in your slicer or a mesh editor before printing; volume and weight may be off.
- **Skipped**: meshes over 500,000 triangles skip the check so the page stays quick.