Calculate filament usage

Convert slicer plastic volume into filament length and material weight.

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ToolFilament Usage Calculator
Input
Output
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Preview

How it works

Print volume in cubic centimetres is multiplied by material density for mass. The same volume becomes cubic millimetres and is divided by circular cross-section π(diameter/2)^2 for length.

  • PLA density and 1.75 mm are editable common starts.
  • Slicer volume already reflects the selected geometry.

Worked example

A 2.4cm3 part in PLA
Volume taken from the slicer preview
Input
											2.405
Output
												Length m: 1
Weight g: 2.98
Cross section mm2: 2.405
Density used: 1.24

When to use this

Slicer previews, spool planning, and diameter comparisons use volume conversion.

Edge cases

  • Diameter changes length quadratically through radius squared.
  • Density changes weight without changing geometric length.
  • Purge and support waste may not be included in slicer volume.