Support Material Calculator
Support Structures Are Printed Plastic You Throw Away
On an FDM printer, support material is extruded from the same expensive spool as the model itself, then snapped off and discarded once the print finishes. Estimating support weight and cost separately from the model's own material is useful when deciding whether a design change or a different orientation is worth the reduction in waste, and when pricing a print that requires heavy overhangs.
The Formula
Support Weight = Support Volume × Density
Support Cost = (Support Weight / 1000) × Price per kg
Where This Calculation Matters
- Justifying design-for-printability changes — adding a chamfer or splitting a model into two parts to eliminate overhangs pays for itself in reduced support material.
- Comparing orientation options — the same model printed flat versus on end can have drastically different support volumes.
- Quoting jobs with heavy overhangs — miniatures, brackets, and models with bridging features often need 10–30% support material by volume.
- Evaluating soluble support cost — PVA or HIPS soluble supports are typically priced higher per kilogram than standard PLA, making an accurate weight estimate more important for cost control.
Worked Example
A 60 cm³ PLA model (density 1.24 g/cm³) with 15% support material by volume uses 9 cm³ of support, weighing 11.16 g. At $20 per kilogram, that support material costs roughly $0.22 — small on its own, but it scales linearly with batch size.
How to Use This Calculator
- Enter the model volume in cm³.
- Enter the support material as a percentage of model volume (check your slicer's support preview for this figure).
- Enter the material density in g/cm³ for the filament being used.
- Optionally enter the material price per kilogram to get a cost figure.
- Select Calculate to get support weight and cost.
Related Calculations
Combine with the Infill Percentage Calculator for a complete material breakdown, or total everything with the 3D Print Cost Calculator.