Have you ordered the "same" black filament twice and gotten two different blacks? That's batch-to-batch color drift — a real cost for brands, farms and multi-part projects. Here's what's happening and how to avoid it.
What ΔE means
ΔE (Delta E) measures perceived color difference. ΔE below 1 is invisible to most people; ΔE 1–3 is noticeable side-by-side; ΔE 3+ is clearly different. Professional filament brands hold ΔE < 1.5 against a master sample.
Why batches drift
- Masterbatch dosing: manual dosing drifts; gravimetric (weighed) dosing holds color steady
- Processing temperature: over-heating changes pigment and polymer color
- Resin changes: different resin lots shift the base color
- No measurement: suppliers that don't measure color can't control it
What to ask any supplier
- What ΔE do you guarantee between batches?
- How is color measured — spectrophotometer or eyeball?
- Can you ship a color report with my order?
- Do you save a master sample per color?
VOXFIL measures every production lot with a spectrophotometer, holds masters for 200+ colors, and ships ΔE reports with bulk orders. If color consistency is your business, that's the number that matters.