SainSmart Light Weight Filament 1.75mm LW-PLA - Low Density for RC

In this review of the SainSmart Light Weight Filament 1.75mm LW-PLA, the bottom line is simple: this filament is for makers who need strong, ultra-light prints, especially for RC planes, drones and wearable cosplay pieces. The single biggest reason to buy is its active foaming behavior that reduces part density to roughly 0.54g/cm3, cutting weight dramatically compared with regular PLA and allowing builders to lower wing loads or create lighter cosplay armor without sacrificing layer bonding. The reviewer found it particularly useful when dialing temperature and flow to tune expansion on the fly.

Key Features

• Reduced Weight: The active foaming formulation yields a much lower part density, which reduces overall weight and improves flight performance for RC models.
• Active Foaming Control: Unlike pre-foamed alternatives, the foaming activates during printing so users can control expansion via temperature, print speed and flow.
• Unlimited Customization: The filament begins expanding above about 210 C, letting makers vary density within a single print by changing settings mid-job.
• Material Efficiency: Expansion lets you print at higher flow so a single roll can equal roughly 2.2 rolls of ordinary PLA by volume, saving material costs on large projects.
• Smooth Finish & Paint Friendly: Prints have a matte surface with reduced layer lines and good paint adhesion for cosmetic parts and cosplay pieces.
• Good Bonding for Repairs: The expanding PLA shows strong interlayer bonding, which helps drop resistance and makes field repairs easier on RC parts.

Who It's For

The filament is ideal for hobbyists and makers building lightweight functional parts such as RC plane wings, drone airframes, and cosplay armor where weight savings and repairability matter. Users who like to experiment with temperature and flow to tune the expansion ratio will get the most benefit, since the material rewards careful calibration.

It is less suitable for someone who needs predictable, dimensionally stable, high-temperature parts or for first-time users who are not comfortable adjusting print temperature and flow; those who need exact tolerances or rigid mechanical components should choose a standard PLA or engineering filament instead.

Pros & Cons

Pros

• Noticeable weight reduction compared to normal PLA, improving RC performance and wearable comfort.
• On-printer control of foaming allows creative density gradients and variable part strength.
• Material efficiency: one spool can produce up to approximately double the printed volume of ordinary PLA.
• Matte, smooth surface with good paint adhesion for finishing and cosplay work.

Cons

• Requires experimentation with temperature and flow to achieve desired expansion; not plug-and-play for novices.
• Final dimensions can vary with expansion, so tight tolerance parts may need design compensation.

Specifications

Brand	SainSmart
Material	LW-PLA (active foaming PLA)
Diameter	1.75mm
Spool Weight	1KG
Typical Density	~0.54g/cm3 (expanded)
Activation Temperature	Begins expanding above 210 C
Intended Use	RC planes, drone parts, cosplay, lightweight models

Our Verdict

For makers who prioritize weight savings and creative control over part density, the SainSmart LW-PLA is a strong value: it cuts part weight dramatically, doubles printable volume per spool in many cases, and yields paint-ready, repairable prints. Those willing to tune temperature and flow will find it especially valuable for RC and cosplay applications, while users needing tight dimensional control should consider standard PLA alternatives.

Frequently Asked Questions

How do I make the filament expand?
Increase nozzle temperature above roughly 210 C and adjust print speed and flow; higher temperatures (for example near 240 C) increase foaming and volume expansion.

Can I use this for functional RC parts?
Yes, it is well suited for RC planes and drones where reduced weight and good layer bonding improve performance, though designers should account for dimensional change from expansion.

Is the surface finish paintable?
Yes, printed parts have a smooth matte finish and accept paint well, making this filament useful for cosplay and cosmetic models.