Filament Mixer

Mix the filament you have into the colour you need.

Pick a target, add your spools, and get an estimated blend in percent and grams.

Target colour

Grey
#808080 · rgb(128, 128, 128)

Available filaments

2/6

Calibration Test Card

Print a card of two-filament tiles, then record the colours you actually see to learn how this pair behaves on your printer.

The AMS does not physically blend filaments. This calibration card tests the appearance produced by controlled filament combinations so Filament Mixer can learn from your actual printer, filament and print settings.

10 tiles (2 × 5, 40 × 40 × 3 mm) at nominal filament proportions A/B: 0/100, 10/90 … 75/25, 90/10, 100/0. Tile colours are expected colours from the Physical Filament Model — not printed results. Your slicer may need you to assign filaments yourself.

Calibration Card V2 — ratio test (0.4 mm nozzle)

Prints 1 mm Filament A / Filament B pattern tiles from target −20% to +20% in 5% steps, so you can pick the ratio that looks best in real life.

Tiles (A/B): 30/70 · 35/65 · 40/60 · 45/55 · 50/50★ · 55/45 · 60/40 · 65/35 · 70/30

A simple baseline estimate: blends colours mathematically in a perceptual colour space.

How it works

  • Colours are converted to CIELAB, a space designed around human perception — not averaged as raw RGB.
  • Every combination of your filaments is searched in 1% steps, and the mix with the lowest ΔE 2000 (colour difference) to your target wins.
  • Screen RGB isn't physical filament colour. Pigments absorb and scatter light, so dark pigments often dominate. Treat results as a starting point.
  • Calibration improves accuracy: record the colour you actually see in a print and how strongly it tints.
  • The Physical Filament Model mixes colours the way pigments absorb light (inspired by Kubelka–Munk), so dark and strong filaments dominate. It's still an estimate, not a lab-grade pigment model.

Calibrate your filament

  1. Print a small swatch of each spool and compare it to a colour picker under daylight.
  2. Tap Calibrate on a filament and enter the observed colour.
  3. Set tint strength: above 1 if a little of it goes a long way (e.g. black), below 1 if it's weak or translucent.
  4. Save it to your library — stored on this device, no account needed.

For best results, test a small amount first. Physical colour depends on pigment, opacity, extrusion temperature, layer thickness and mixing hardware.