How much extra material do supports use?

Supports typically add 5-30% extra material depending on the model geometry, support density, and overhang area. A model with many overhangs and dense supports can use up to 50% more material.

What support density should I use?

Light density (5%) works for small overhangs and gentle angles. Normal density (10%) is a good default. Dense supports (20%) are needed for large flat overhangs, heavy parts, or materials prone to drooping like PETG.

How do I reduce support waste?

Orient the model to minimise overhangs. Use tree supports instead of grid supports for organic shapes. Reduce support density where possible. Add chamfers to overhanging edges in your design to bring angles below 45 degrees.

Are tree supports better than standard supports?

Tree supports often use 30-50% less material than standard grid supports and are easier to remove. They work especially well for organic shapes with scattered overhang areas. Standard supports are better for large flat overhangs.

3DPrintCalcs

Support Calculator — Extra Material & Time for Supports

Estimate extra material and time needed for support structures.

Model Volume

From your slicer

Support Area

% of model needing support

Layer Height

Height of each printed layer

Print Speed

Speed of the print head in mm/s

Support DensityScales the estimate relative to a normal support: Light halves it (×0.5), Dense doubles it (×2). Normal is the ×1 baseline

MaterialSelect the material type

How We Calculate This

Support Estimation Formulas

Support volume = Model volume x Support area % x Density scale
Support weight = Support volume x Material density
Extra time = Support volume / (Speed x Layer height x Line width)
Material increase = Support weight / Model weight x 100%

The support area percentage estimates what fraction of the model volume sits above unsupported overhangs, used here as a quick first-order estimate. The density scale (Light x0.5, Normal x1, Dense x2) adjusts that estimate up or down relative to a typical support — it is a relative multiplier, not a literal slicer infill percentage, so the result is not simply “model volume x 20% infill”. Real support volume also depends on overhang geometry the slicer can model more precisely.

Frequently Asked Questions

Related Calculators

Scale Calculator

Scale a model up or down and see the resulting dimensions and volume change.

Tolerance Calculator

Calculate clearance tolerances for parts that need to fit together.

Shrinkage Calculator

Compensate for material shrinkage by scaling your model dimensions.

Fit Calculator

Determine press-fit, transition-fit and clearance-fit dimensions for printed parts.

Clearance Calculator

Calculate the gap needed between moving or sliding 3D printed parts.

Last updated: February 2026

All calculations are estimates. Always verify settings with test prints before committing to final prints.