Scale an STL to the right size

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Resize an STL proportionally or set a target dimension. Check the preview before saving the change.

Rendered example views: 1 shows the original model and 2 the calculated result. The images illustrate the model geometry, not the editor interface.

A simple example

A plate is 60 mm long and needs to become 75 mm long. Use a scale factor of 1.25.

Step by step

1. Upload the STL and open the model editor.
2. Choose Scale. Use uniform scaling to preserve the shape.
3. Enter 1.25 or set the target dimension. Keep the aspect ratio locked when using a target dimension if you want matching proportions.
4. Check the new overall dimensions in the preview, then choose Apply.

What to check

Holes and wall thicknesses scale too. Separate X/Y/Z factors can turn a round hole into an oval.

Preview and save

A preview is not a saved change. Wait for the checked result and choose Apply. If the button is disabled, read the message and check the selection or inputs. The offered STL download is paid; you will see the current price before purchase.