Filament & Resin Calculators
Multi-Color Purge Waste Cost Calculator
Estimate how much filament and money color changes, flushing, and a purge tower add to a multi-color 3D print.
How to Use This Calculator
- Copy the color-change count from your sliced multi-color job, then enter an average purge volume from your flush or purge settings.
- Enter your own filament density and price, plus optional model and purge tower weights from the slicer.
- Compare transition purge weight, total waste cost, waste percentage, and total material cost before quoting or revising the print.
Inputs and Assumptions
| Number of color changes | Use the color-change count shown after slicing. |
|---|---|
| Average purge volume per change | Enter an average based on your slicer flush or purge settings. |
| Filament density | Use the value from your material documentation or a measured sample. |
| Filament price | Enter your actual purchase price. No live price is fetched. |
| Model print weight | Used for the waste percentage and total material cost. |
| Purge tower or other waste | Add measured prime tower, wipe tower, skirt, or other slicer waste. |
Multi-color purge waste example
With 40 color changes, 120 mm3 of average purge volume per change, 1.24 g/cm3 filament density, a 60 g model, and a 6 g purge tower, transition purging uses about 5.95 g. Total waste is about 11.95 g and costs about $0.29 at $24/kg.
What Counts as Purge Waste
- Transition filament flushed when the tool changes from one color to another.
- Prime, purge, or wipe tower filament reported separately by the slicer.
- Optional skirt, wipe, or startup waste when you include it in the manual tower field.
- Model filament is kept separate so the waste percentage remains visible.
Use Purge Cost in a Quote
Treat purge waste as part of the material line for a multi-color print. The result is not a complete customer quote because it does not include electricity, machine time, labor, failures, shipping, or margin.
Formula
Transition purge weight = color changes × average purge volume per change × filament density / 1000. Total waste = transition purge weight + purge tower weight. Purge waste cost = total waste × filament price per kg / 1000.
Limits of This Calculator
- Actual purge volume can vary by color pair, material, temperature, printer, and slicer profile; an average per change is an estimate.
- The calculator does not predict color contamination or recommend a minimum safe flush volume.
- Use sliced or measured values when possible. No printer, slicer, model file, or live price source is connected.
FAQ
Where do I find the number of color changes?
Slice the multi-color job and use the color-change or filament-change count reported by your slicer.
Does this connect to Bambu Studio, PrusaSlicer, or another slicer?
No. Enter the slicer values manually. The calculator does not connect to software or upload project files.
Should I include the purge tower weight?
Yes, when your slicer creates a prime, purge, or wipe tower. Add its estimated or measured weight as separate waste.