3D Quality ToolsSTL measurement and scaling
Find your model’s width, height and depth, interpret its design unit, and calculate a proportional scale for the size you want to print.
STL geometry is stored as unitless coordinates, so STL files do not reliably contain unit metadata. You choose how those coordinates should be interpreted after measurement.
Upload an STL to measure its width, height and depth.
Select a non-empty .stl file, up to 25 MiB.
Open in STL Viewer to inspect the shape, local dimensions and point-to-point feature measurements in your browser.
Designing holes, pins or mating parts? Use the 3D Print Tolerance & Clearance Calculator before exporting the final STL.
An STL records vertex coordinates but normally does not say whether a value of 50 means 50 millimetres, centimetres, metres or inches. Select the unit used by the design software, then use the conversions and proportional scale calculator above to prepare the intended print size.
Use the displayed unit conversion to confirm scale before slicing. Proportional scaling keeps the model shape intact, while the build-volume comparison checks the current dimensions against your printer.
No reliable unit metadata is embedded, so use the unit from your modelling software.
Yes. The checker converts the same measured coordinates for display without changing your source file.
Enter its usable build dimensions to compare it before slicing.
STL Quality Checker · STL Volume Calculator · Why STL Files Have No Units · STL Print Preflight Checker · How to Make an STL File Printable · All STL tools
Check brims, excluded areas and placement after nominal fit
A 2-unit CAD width intended as inches is 50.8 mm, not 2 mm. Confirm a known reference dimension before applying a 25.4 correction. The batch cube similarly changes from 20 mm to 508 mm under an inch interpretation, without changing its source coordinates.
An illustrative 250 × 210 × 180 mm box cannot fit a nominal 180 mm cube bed in any right-angle orientation. It fits a nominal 256 mm cube geometrically, but its 6 mm margin on one axis does not reserve space for brims or excluded regions. Check the real slicer bed before printing.
Compare the same model against named printersDownload the owned 20 mm cube sample, or the declared-inch 3MF sample. For a G-code preview, use the actual Arachne slicer export. Model samples are illustrative geometry; the G-code is for inspection and must not be sent to a printer.
Numerical scenarios are illustrative software examples, not physical print tests.