How to calculate 3D slicer scale percentage
Resize a scale-model file by comparing source and target denominators.
How it works
1:72 to 1:48 is 150%, so enlarge the file.
Checked example
1:48 to 1:72 is about 66.667%, so reduce it.
Workshop notes
Thin walls and details may not remain printable; verify one known dimension.
Confirm the source ratio
The file name is not always reliable. Measure one known feature in the mesh or compare it with the designer's documentation. A wrong source ratio produces a perfectly calculated but incorrectly sized print.
Enter the percentage uniformly
Use the same percentage on X, Y, and Z unless you are intentionally correcting distortion. Lock uniform scaling in the slicer. After resizing, inspect the displayed dimensions and compare one known length with the converter result.
Understand enlargement
Moving from 1:72 to 1:48 uses 72 ÷ 48 × 100 = 150 percent. The model becomes 1.5 times as large in every linear direction. Its volume increases much more than 1.5 times, so resin or filament use and print time can rise sharply.
Understand reduction risks
Moving from 1:48 to 1:72 gives about 66.667 percent. Walls, pins, engraved lines, and clearances shrink with the model. Review minimum feature sizes, supports, drainage holes, and tolerances before printing.
Frequently asked questions
What percentage converts 1:72 to 1:48?
150 percent.
What percentage converts 1:48 to 1:72?
About 66.667 percent.
Does scaling change print tolerance?
Yes. Clearances and feature thicknesses scale too, but the printer's physical limits do not.
Why should I verify a known dimension?
It confirms that the file's stated source scale and the slicer's final size match the calculation.