Why do multi-color prints waste so much filament?
A single-nozzle printer has to push the old color out of the hot end before the new one comes out clean. That flushed plastic — the “poop” on Bambu printers, or the wipe tower on others — is waste. Because it happens at every layer where colors change, a print with a few hundred changes can waste more filament than the model itself.
How can I reduce purge waste?
- Print more copies per plate. Every object on the plate shares the same color changes, so waste per part drops.
- Lower the flush multiplier for similar colors and light-to-dark changes, and test the result.
- Flush into infill or supports, so purged plastic ends up inside the part.
- Reduce color changes by moving detail colors onto fewer layers.
Should waste be included in my price?
Yes. If you sell multi-color prints, add the waste to the filament cost before you set a price — use the total here in the print cost calculator, then check margin with the Etsy profit calculator.
Frequently asked questions
What is the default flush volume in Bambu Studio?
Bambu Studio uses about 280 mm³ per filament change as its default, adjusted by a flushing-volume table for each color pair and a multiplier (default 1.0). Your actual value appears in the flushing volumes dialog.
How many grams does one color change waste?
With a 280 mm³ flush, roughly 0.35 g of PLA. Real-world totals per change are often higher — commonly reported at around 0.3 to 1.5 g — once higher flush values for dark-to-light changes and the cut-off filament piece are included.
Does a prime tower waste filament?
Yes. It stabilizes extrusion after each change, so it’s added on top of the flush. Your slicer reports its weight; you can make it smaller or skip it for some prints.
Sources
Estimates for planning. Results depend on the numbers you enter — use the gram, hour and ml figures from your slicer, and your real material and power prices. Material densities are typical values; check your spool or bottle datasheet for exact figures.