How much material is wasted on supports?

Supports typically use 10-30% extra material depending on the model geometry. Tree supports in modern slicers use significantly less material than traditional linear supports.

What is a normal failure rate?

A well-tuned printer should have a failure rate under 5%. New users might experience 10-20% until they learn optimal settings. High failure rates usually indicate calibration issues.

Purge lines (skirts, prime lines) are printed at the start of each job to clear the nozzle and confirm flow. A single short prime line is tiny — a 30mm bead at 0.4mm width and 0.2mm layer height is only about 0.003g of PLA. Multi-line skirts, long purge buckets or a wipe tower in multi-material printing use far more (well over 0.5g per print), so raise the purge line length or the advanced purge factor to model those.

3DPrintCalcs

Material Waste Calculator — Failed Prints & Supports

Estimate wasted material from failed prints, supports and purge lines.

Filament per Print

Mass of filament in the finished part, from your slicer's estimate (g)

Support Material

Extra filament for supports as a % of part mass — 10-30% typical, tree supports use less

Failure Rate

Share of prints that fail and are scrapped — under 5% for a tuned printer

Prints per Month

How many jobs you run per month — used to scale waste to a monthly total

Purge Line Length

Total length of prime/skirt line deposited before each job (mm) — a single skirt loop is roughly the part perimeter

Include purge waste

Count the prime/skirt line in the waste total (small per print, adds up over a month)

How We Calculate This

Formula

Support waste = Filament per print x Support percentage
Failure waste = Filament per print x Failure rate
Purge waste = Purge line length x 0.0001 g/mm
Total waste = Support + Failure + Purge waste

The purge factor is the mass of one millimetre of deposited skirt/prime line. A typical 0.4mm-wide bead at 0.2mm layer height has a cross-section of 0.4 x 0.2 = 0.08 mm², so 1mm of line is 0.08 mm³. At PLA density 1.24 g/cm³ (0.00124 g/mm³) that is 0.08 x 0.00124 ≈ 0.0001 g/mm. A 30mm prime line is therefore only about 0.003g — purge is a tiny fraction of waste compared with supports and failed prints. Increase the factor for fatter beads, taller layers or denser filaments (PETG 1.27, ABS 1.04 g/cm³), or to model a multi-line wipe tower.

Frequently Asked Questions

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Last updated: February 2026

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