Multi-Color Purge Waste Cost Calculator

How to Use This Calculator

1. Copy the color-change count from your sliced multi-color job, then enter an average purge volume from your flush or purge settings.
2. Enter your filament density and price, plus model and purge tower weights from the slicer.
3. Add a measured average change time, any other multicolor-only machine time, and your own machine hourly cost.
4. Compare purge material cost, extra change time, and combined multicolor overhead before quoting or revising the print.

Inputs and Assumptions

100-change multicolor cost example

With 100 color changes, 120 mm3 of purge volume per change, 1.24 g/cm3 filament density, a 60 g model, and a 6 g purge tower, total waste is 20.88 g and costs about $0.50 at $24/kg. At 60 seconds per change, 10 additional multicolor minutes, and a $2/hour machine cost, the extra 110 minutes cost about $3.67. Combined multicolor overhead is about $4.17, or $0.04 per change.

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.

What Counts as Change Time

• Filament transport, unloading, cutting, loading, and feeder movements during each change.
• Nozzle wiping or cleaning, flushing, pressure recovery, and the restart sequence.
• One-time multicolor routines, such as extra priming or tower startup, entered in the additional time field.
• Hands-on operator time should be priced as labor in a complete quote rather than hidden in the machine rate.

Use Multicolor Overhead in a Quote

Treat purge waste as a material line and the extra change-time cost as a machine-capacity line. The combined result is still not a complete customer quote because it excludes normal model material, electricity, hands-on labor, failures, shipping, and margin.

When your main cost calculation already applies a machine rate to the full slicer duration, use this page to inspect the waste and time burden but do not add the change-time cost again.

• calculate the full production cost
• build a complete customer quote
• estimate your print farm machine-hour cost

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. Extra change time = color changes × average seconds per change / 60 + other multicolor machine minutes. Change-time cost = extra change time / 60 × machine hourly cost. Combined multicolor overhead = purge waste cost + change-time cost.

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.
• Change time varies by feeder, cutting and loading sequence, nozzle cleaning, flush volume, prime tower, and slicer profile.
• Machine hourly cost is not a labor rate. Add hands-on labor, electricity, failures, margin, and normal print time in a complete cost or quote calculation.
• If your full slicer time already includes color changes, do not add the same change-time machine cost twice.
• 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