Wood PLA is one of the first and most popular composite filaments, bringing the organic aesthetic and texture of real wood into the world of plastic 3D printing. It’s not just about color; this material actually contains wood particles, which is evident not only in its appearance and scent but also places specific demands on the printer’s hardware and the printing process.
What is Wood PLA and what is it made of?
Wood PLA is a composite material consisting of two main components: a base polymer, usually PLA, and a filler in the form of fine wood dust or fibers. The wood particle content typically ranges between 15% and 30% by weight. Various types of wood are used as filler, such as pine, bamboo, cedar, cork, or ebony, allowing for different shades and textures. During printing, the PLA melts, and the wood particles release a characteristic scent reminiscent of working in a woodworking shop.
Advantages and Disadvantages
This material is a choice for specific projects where aesthetics are more important than mechanical durability.
Advantages:
- Authentic wood look and feel: Prints have a matte, slightly porous surface that looks and feels like wood or wood fiberboard.
- Pleasant scent during printing: Instead of the typical plastic smell, there is a scent of burning wood.
- Excellent for post-processing: Prints can be easily sanded, cut, stained, and varnished just like real wood, allowing for a very realistic final appearance.
Disadvantages:
- High abrasiveness: Wood particles are hard and act as an abrasive. As they pass through the nozzle, they quickly wear it down. A standard brass nozzle will be destroyed after several tens of hours of printing.
- Susceptibility to nozzle clogging: Wood fibers can form clumps in the nozzle and cause clogging, especially with small diameter nozzles.
- Lower mechanical strength: The presence of wood particles disrupts the polymer matrix, leading to lower strength and higher brittleness compared to pure PLA. It is not suitable for functional, mechanically stressed parts.
- Hygroscopy: Like wood, this filament strongly absorbs atmospheric moisture, requiring careful storage and often drying before printing.
How much does it cost?
As a specialized composite, Wood PLA is more expensive than standard materials. The price usually ranges from 800–1200 CZK for a 0.75 kg spool.
Hardware Requirements and Print Settings
Successful printing with Wood PLA requires not only specific slicer settings but, more importantly, essential modifications to the printer’s hardware. Ignoring these requirements will almost certainly lead to failed prints and equipment damage.
The key to success is understanding that you are printing a composite with solid particles. A standard brass nozzle is completely unsuitable for this task. Hard wood particles act as an abrasive paste and quickly enlarge the internal diameter of the nozzle during printing. This process, known as abrasion, leads to a loss of accuracy, underextrusion, and eventually the complete degradation of the nozzle.
Therefore, the following two hardware modifications are essential:
- Hardened Steel Nozzle: This is an absolute must. Hardened steel is much more resistant to abrasion and will last many times longer when printing with filled filaments than brass. This is the most important upgrade for printing with Wood PLA.
- Wider Nozzle Diameter: Wood fibers can easily get stuck in a standard 0.4mm nozzle. To significantly reduce the risk of clogging, it is strongly recommended to use a 0.5mm or, even better, a 0.6mm nozzle. A larger opening provides a freer passage for particles.
Print Settings:
- Nozzle Temperature: Usually in the range of 190–230 °C. An interesting effect can be achieved by slightly changing the temperature during printing (if the slicer allows it). Higher temperatures will result in a darker, “scorched” color of the extruded material, which can simulate wood grain.
- Print Speed: It is recommended to print slower, typically 40–60 mm/s. Lower speed reduces pressure in the nozzle and minimizes the risk of clogging.
- Retraction: Too frequent or long retractions can contribute to clogging. It is advisable to experiment with reducing the retraction distance or disabling it entirely for parts of the print where it is not critical.
Reported Problems and Their Solutions
- Nozzle Clogging: The most common problem. The solution is preventative maintenance and correct hardware: use a hardened steel nozzle with a diameter of 0.5 mm or more, print slower, and keep the filament perfectly dry.
- Filament brittleness and breakage: Wood PLA on the spool is more brittle than standard PLA. Ensure that the filament path from the spool to the extruder is smooth and free of sharp bends.
- Poor surface quality (Stringing, Blobs): Often caused by wet filament. Always dry the filament in a dryer or oven at a low temperature (approx. 40-45 °C for several hours) before printing.
Environmental Aspect
Although Wood PLA contains a natural component, its base is still PLA. Due to its hybrid composition, it cannot be recycled or composted in home conditions. It belongs in mixed waste.
Surface Treatment: The Path to Real Wood
The strength of Wood PLA lies in its post-processing capabilities, which can transform a plastic print into an object indistinguishable from real wood.
- Sanding: Wood PLA prints sand very easily, much better than pure PLA. The surface is softer and does not melt as easily. Start with 120–150 grit sandpaper to remove layers and gradually move to finer grits (220 and above) to achieve a smooth surface.
- Staining and Varnishing: After sanding, the surface is ready for further treatment. Any common wood stain can be applied. The stain will soak into the porous structure and enhance the wood-like texture. After the stain dries, the print can be protected with a layer of clear varnish (matte or glossy) for a final look and protection.
