A model can fill the preview yet arrive tiny in a slicer, or exceed its print area. Check intended dimensions and units rather than judging a zoomed view. Do this before another export or a print.
Start with the source settings
SketchUp's guide distinguishes STL import units from export units: import defaults to millimetres, while export uses the model's units and allows another choice. Check both ends rather than assuming identical interpretation across applications.
Our recommendation is to record at least one known dimension and its unit from the source, then compare it with the destination before scaling.
Follow a short audit trail
| Stage | What to record |
|---|---|
| Design application | Intended dimensions and units |
| Export | Actual unit and export settings |
| Import | Units chosen by the destination |
| Loaded object | Reported width, length and height |
If someone supplied the model, ask for its intended size. Do not guess from the shape alone. Avoid stretching only one axis to match a dimension without checking the remaining proportions.
Inspect with FileMyLove
Open View 3D and select the STL. Inspect its shape and reported dimensions. The site's size values come from the loaded coordinate bounds; they do not certify the intended physical units.
If you need another format, use Convert 3D, then reopen the output in its destination. This workflow has no unit-selection or correction step. Make necessary unit or scale changes in a capable design application or slicer.
Before handing it off
- Keep the original before changes.
- Confirm units and intended size with the designer.
- Check all three dimensions in the destination.
- Inspect orientation and part completeness separately from size.
- Send confirmed dimensions alongside the file.
A model opening successfully is not proof that it is ready to print. See STL, OBJ and 3MF for printing for format choices, or 3D PDF still views for a visual reference sheet.
