Spectrum ASA LW UltraFoam 3D Printing Filament, Navy Blue, 0.75kg Refill

Spectrum ASA LW UltraFoam is a professional technical 3D printing filament that combines the excellent UV and weather resistance of standard ASA with advanced active foaming technology. This lightweight material enables up to a 3x weight reduction of printed parts without compromising structural integrity or surface quality. It is an ideal solution for users seeking durable, lightweight, and visually appealing components for outdoor and technical applications where weight efficiency is critical. The filament is based on the proven Spectrum ASA 275 formula, enriched with additives that allow for controlled expansion during the printing process.

Advantages

The primary advantage of this filament is its ability to significantly reduce the weight of printed objects, achieving a density as low as 0.33 g/cm³ when fully foamed. By adjusting the printing temperature between 230°C and 285°C, users gain precise control over the material's expansion and final density. This unique property allows for a much higher yield, as one spool can effectively produce the volume of three standard spools. Furthermore, the matte and rough surface finish is highly effective at masking layer lines, providing a professional aesthetic. The material retains all the core benefits of ASA, including high dimensional stability and resistance to harsh environmental conditions.

Suitable for

• RC modeling and drone components
• Lightweight functional engineering prototypes
• Outdoor enclosures and weather-resistant parts
• Aerospace and automotive hobbyist projects
• Weight-sensitive structural components

When it may not be suitable

This filament is not recommended for applications requiring high-gloss surface finishes, as the foaming process inherently creates a matte, textured appearance. Additionally, it may not be the best choice for beginners, as achieving optimal results requires careful calibration of flow rates, temperatures, and retraction settings to manage the expansion process effectively.

Key specifications

• Material: ASA with active foaming technology
• Density: 0.33 g/cm³ to 1.08 g/cm³
• Nozzle temperature: 220°C–285°C
• Heated bed temperature: 60°C–90°C
• Printing speed: 15–150 mm/s
• Spool type: Eco-friendly cardboard core (ReFill)

How to use

To achieve the best results, you must first determine the expansion rate of the filament. Start by printing a single-perimeter test cube in vase mode across the 230°C–285°C temperature range to identify the temperature that yields the thickest wall. Once the optimal temperature is found, print calibration cubes while gradually reducing the flow rate until the wall thickness matches your nozzle diameter. It is essential to keep the fan speed low (0–10%) and print speeds slow during calibration. Always ensure the filament is dry before use, as moisture can negatively impact the foaming process.

What to consider before purchase

• Requires a printer capable of handling high temperatures and precise flow control
• Compatible with BambuLab reusable spools or custom-printed master spools
• Requires manual calibration for each specific printer setup
• Not suitable for high-speed printing without prior density testing

Usage recommendations

For the best results, use an enclosed-chamber printer to maintain consistent temperatures. If the model adheres too strongly to the build plate, reduce the bed temperature or use a suitable adhesive aid. If the final part appears brittle, increase the flow rate slightly to improve layer bonding.