Changing scale does not confirm fit.

A 1:10 scale represents one tenth of the reference size. At 1:24, the same reference is represented at a smaller size. The larger the denominator, the smaller the model. That relationship is useful only if we know the scale at which the particular file was prepared.

Check the exact variant in the package: a part may have been adapted for another platform or size. Do not assume every file in a folder shares a scale. If it is unavailable, compare a known dimension with a reliable reference before assigning a scale based on appearance.

To move from 1:x to 1:y, the factor is x ÷ y. The percentage to apply is 100 × x ÷ y. From 1:10 to 1:24, the result is 41.666…%, or 41.67% rounded to two decimal places. A dimension of 100 mm in the file would become approximately 41.67 mm.

Apply the same factor to all three axes to preserve proportions. The reverse change, from 1:24 to 1:10, is 240%. Keep more precision if your tool allows it and check the final dimensions: rounding the percentage also rounds the resulting size.

The calculator's optional dimension is the part's current measurement in the file, not the full-size object's measurement unless the file is at 1:1. Convert units correctly: 10 cm is 100 mm. Changing centimetres to millimetres expresses the same length; changing scale alters that length.

The workshop calculator accepts millimetres or centimetres and returns the result without modifying your files. After entering the percentage in your slicer, check at least one recognisable dimension. If it differs by a factor of ten or a thousand, review the unit interpretation before proceeding.

Uniform scaling also changes holes, clearances, walls and mounting distances. A screw, bearing, shaft or electronic component you already own does not change size. A visually proportionate part may stop working when connected to those components.

Compare critical measurements with the real components: mounting diameters and spacing, wheelbase, cable space or joint travel. If a region needs adaptation, work on a copy and record the change. Before redistributing a variant, review the conditions of the source licence.

When reducing a model, some details and walls may fall below what your configuration can resolve. When enlarging it, it may no longer fit in the printer. Review the layer preview, orientation and supports again; settings that worked at the original size are not automatically validated.

Do not calculate time or material by simply multiplying previous values by the percentage. Slice again using the final size and configuration. Keep the new estimates labelled as estimates. For a build sensitive to fit, print a joint or a critical detail first and measure the result.

Keep the original, prepared copy, source and target scales, applied percentage and the dimensions you checked. If you change one axis differently or adjust a hole separately, document that adaptation: it is no longer just a uniform scale change.

Show your result with your own photographs and a measurement reference in the same plane as the photographed area. State which components you have tested and which remain unchecked. A short, specific assembly note is more useful than a general compatibility claim.