Shrinkage compensation calculator

Print a calibration piece, measure it, and get the exact scale % for your slicer. Dial in extrusion first with the rotation distance calculator — over-extrusion fakes shrinkage — then check the max print speed for your material.

How it works

The correction is a ratio: new scale = current scale × (designed ÷ measured). A part designed at 50 mm that measures 49.55 mm needs 100 × 50 ÷ 49.55 ≈ 100.91%. Corrections compound — they multiply, they do not add: if you apply two successive corrections, the total scale is their product (a common forum mistake is adding the percentages, which drifts further off each iteration). Most ABS/ASA filaments land in a 0.995–1.005 shrink factor (99.5–100.5% scale) window; far outside that, suspect over-extrusion, wet filament or a cooling problem rather than pure shrinkage. Reverse mode answers “at this scale %, what size will my part actually print?”