Spectrum LW-ASA UltraFoam 1.75mm is a professional lightweight ASA filament utilizing active foaming technology that significantly reduces the weight of printed parts—up to three times lighter compared to standard ASA. Based on the trusted Spectrum ASA 275 formulation, it incorporates additives that enable controlled expansion during printing.

Foaming activates around 230 °C, reaching maximum performance at 270–285 °C. Below 230 °C, the material behaves like standard ASA, offering excellent flexibility in print tuning. When fully expanded, the filament reaches an extremely low density of about 0.33 g/cm³, allowing material flow to be reduced by up to 66%.

Key features

• Over 3× weight reduction

• Active foaming technology (230–285 °C)

• Adjustable density and full control over flow

• Very low final density (~0.33 g/cm³)

• One spool yields up to 3× more output vs standard ASA

• UV and weather-resistant – suitable for outdoor use

• Matte, rough finish that hides layer lines

• Color may lighten under higher foaming conditions (applies to all colors)

Technical specification

• Diameter: 1.75 mm

• Net weight: 750 g

• Density: 0.36–1.08 g/cm³ (depending on foaming level)

• Nozzle temperature: 220–285 °C

• Bed temperature: 60–90 °C

• Printing speed: 15–150 mm/s

• Cooling: 0–20%

• Enclosed chamber: recommended for larger models

• AMS compatibility: Yes

• Surface finish: matte, rough / depends on color

Packaging & storage

Each spool is factory-sealed. Store in a dry environment at 15–25 °C.
For best performance, dry the filament before printing.