Light Weight Filament 1.75mm LW-PLA 1KG - Low Density for RC Parts

Our review looks at the SainSmart Light Weight Filament 1.75mm LW-PLA, a spool built specifically for makers who need strong but featherlight 3D prints. The standout reason to consider this filament is its active foaming behavior: it expands during printing to cut part density roughly in half compared with regular PLA, making it ideal for remote control aircraft, drones and large cosplay pieces where weight directly affects performance. This review focuses on print behavior, tuning tips and real use cases to help decide if LW-PLA fits a given project.

Key Features

• Reduced Weight: The filament prints at a much lower density, about 0.54 g/cm3 versus standard PLA, so finished parts are significantly lighter and reduce wing loading on RC models.
• Active Foaming Control: Expansion is driven by printing conditions so users can tune temperature, speed and flow to control the foaming ratio and final part weight.
• Unlimited Customization: The material begins to expand above roughly 210 C, letting you create sections with variable density by changing temperature or speed mid-print.
• Efficient Material Use: Because the filament expands, you can run up to 2X material flow and effectively get the output of about 2.2 ordinary PLA rolls from one spool.
• Application Ready: The low density and improved layer bonding make the filament suitable for RC planes, drone parts and wearable cosplay parts that must be light yet repairable.
• Smooth Finish & Paint Friendly: Prints show a matte surface with minimized layer lines and good paint adhesion for final finishing.

Who It's For

The filament is best for hobbyists and small-scale builders who prioritize low mass: model aircraft pilots, FPV drone racers and prop makers for cosplay will get the clearest benefit from lighter components and lower stall speeds. Users who like to tune prints for specific mechanical properties will appreciate the ability to vary expansion during a single print using temperature, speed and flow controls.

It is less suited to parts that require full-density mechanical strength without any internal porosity or to users who prefer a plug-and-play filament with no tuning. Beginners should expect a learning curve when dialing in temperature and flow to achieve desired expansion and finish.

Pros & Cons

Pros

• Significant weight reduction for large or flying models, improving performance and handling.
• Control over foaming from the printer enables tailored strength-to-weight ratios in a single part.
• Material expansion allows higher effective print volume per spool, stretching supply costs further.
• Smooth, matte surface with good paint adhesion simplifies finishing and repair.

Cons

• Requires calibration of temperature and flow to achieve consistent expansion; some users report best results near 240 C, so trial and error is needed.
• Expanded structure is lower density than solid PLA, so parts may behave differently under heavy mechanical load compared with standard PLA.

Specifications

Brand	SainSmart
Material	LW-PLA Low-Density Active Foaming PLA
Diameter	1.75 mm
Spool Weight	1 KG
Foamed Density	Approximately 0.54 g/cm3
Typical Expansion Start	Above 210 C (variable with tuning)
Print Yield	Up to about 2.2x equivalent PLA volume per spool

Our Verdict

The SainSmart LW-PLA filament is a practical choice for builders who need to cut mass without sacrificing the ability to tune strength and finish. When users are willing to tune temperature, speed and flow, the filament delivers strong, paint-ready prints that perform well on RC planes, drones and cosplay props while stretching spool value. It is a good-value specialty filament for projects where weight matters more than fully solid density.

Frequently Asked Questions

At what temperature does the filament expand?
Expansion generally begins above 210 C and many users report pronounced expansion and doubled volume around 240 C, though exact behavior depends on speed and flow settings.

Can I print faster or use higher flow because it expands?
Yes, the foaming allows higher material flow and faster fills; users have reported running up to 2X flow to maximize yield while monitoring print quality.

Is the surface finish suitable for painting?
Yes, prints show a smooth matte finish with good paint adhesion, making post-processing and cosmetic work straightforward.