3D printing can be a rewarding hobby, especially when producing high-quality prints with fine details. However, one of the biggest challenges faced by 3D printing enthusiasts is keeping PLA filament dry. PLA, or polylactic acid, is a popular choice for 3D printing due to its ease of use and eco-friendly nature.
But it has an Achilles’ heel—it readily absorbs moisture from the air, which can compromise print quality. Enter drying silica, a potential hero in your 3D printing toolkit. But is it effective in keeping PLA dry?
Understanding PLA and Moisture
What is PLA Filament?
PLA is a biodegradable thermoplastic derived from renewable resources like corn starch or sugarcane. It’s favored in the 3D printing world for its ease of use, low printing temperature, and minimal warping. Its popularity among beginners and professionals alike is unmatched. However, like many thermoplastics, PLA has a penchant for absorbing moisture.
How Does PLA Absorb Moisture?
PLA is hygroscopic, meaning it absorbs moisture from the air. When PLA filament absorbs water, the moisture can cause the filament to swell and create tiny bubbles during printing. This exposure leads to issues such as stringing, blobbing, and weakened print structures.
Impact of Moisture on Printing Quality
Moisture-laden PLA can significantly affect printing quality. The absorbed water turns into steam when the filament passes through the printer’s hotend. This steam can create bubbles and weaken the filament, leading to rough surfaces, reduced adhesion between layers, and sometimes prints that are brittle and fragile.
Can You Use Silica Gel to Keep PLA Dry?
Silica Gel as a Desiccant
Silica gel is a desiccant, which means it is a substance that absorbs moisture from the air. These small beads are often found in tiny packets inside shoe boxes or electronics packaging, and they play a crucial role in keeping items dry.
How Silica Gel Works
Silica gel absorbs moisture through adsorption—a process where moisture molecules adhere to the surface of the gel beads. This makes silica gel an effective tool for reducing humidity around your PLA filament, which can help prevent moisture-related issues during printing.
Types of Silica Gel Products
Silica gel is available in various forms, such as packets, reusable canisters, and bulk beads. The beads can be orange, blue, or white, with some versions featuring an indicating dye that changes color when saturated with moisture.
Benefits of Using Silica Gel with PLA Filament
Preserve Print Quality
By keeping your PLA filament dry, silica gel helps maintain the integrity of your prints. With moisture under control, you’ll experience fewer print defects like stringing or bubbling, leading to smoother surfaces and stronger, more reliable prints.
Extend Filament Shelf Life
Moisture can degrade PLA over time. Regular use of silica gel can extend the shelf life of your filament, ensuring that it remains in peak condition for a longer period. This means less waste and more value from each spool.
Cost-Effective Solution
Silica gel is an affordable way to keep your PLA dry. Many silica gel products are reusable, allowing you to recharge them by heating to remove accumulated moisture. This makes silica gel a budget-friendly option for filament storage.
Steps to Use Silica Gel for Keeping PLA Dry
Step 1 – Prepare Your Storage Container
An airtight container is essential for storing PLA filament. Choose a sturdy, sealable bin that can accommodate your spools. A tight seal will prevent external moisture from entering and ensure the effectiveness of the silica gel.
Step 2 – Add Silica Gel Packs
Place silica gel packs at the bottom of your container. One or two packs per spool should suffice, but consider the size of your container and local humidity levels. Ensure the packets are evenly distributed to maximize moisture absorption.
Step 3 – Regularly Monitor Humidity Levels
A hygrometer is a handy tool for measuring humidity levels inside your storage container. Ideally, you want to keep the humidity below 20% to prevent moisture absorption by the filament. Regular monitoring will help you identify when it’s time to recharge or replace your silica gel.
Step 4 – Recharge or Replace Silica Gel
Silica gel can be recharged by heating it in an oven or microwave. Follow the manufacturer’s instructions on temperature and duration to avoid damaging the gel. Alternatively, replace the silica gel once it’s saturated and loses its effectiveness.
Comparing Silica Gel with Other Drying Methods
Filament Dryers
Filament dryers are devices specifically designed to remove moisture from 3D printing filaments. While they are highly effective, they can be costly and require dedicated space. Silica gel offers a more budget-friendly and less energy-intensive alternative.
Ovens and Food Dehydrators
Ovens and food dehydrators can also be used to dry filament. However, they require careful temperature control to avoid damaging the filament. Silica gel, in contrast, doesn’t involve heat and is safer for continuous use in filament storage.
Comparing Effectiveness and Cost
While filament dryers and ovens might dry filament more quickly, silica gel is a cost-effective, low-maintenance solution that works for ongoing storage. It requires minimal setup and intervention, making it a practical option for hobbyists and those new to 3D printing.
Tips for Storing PLA Filament Long-Term
Use Vacuum-Sealed Bags
For added protection, store your filament in vacuum-sealed bags. These bags remove excess air and create an airtight seal, further preventing moisture from reaching the PLA.
Store in a Cool, Dry Place
Choose a storage location that is cool and dry. Avoid areas with fluctuating temperatures or high humidity, such as basements or garages. Consistent conditions will help maintain the quality of your filament.
Conclusion
Silica gel can be a valuable tool in your 3D printing arsenal. By using it to keep PLA filament dry, you can ensure higher print quality and extend the life of your materials. Remember to store your filament properly, monitor humidity levels, and recharge or replace silica gel as needed.
Whether you’re new to 3D printing or a seasoned pro, keeping your PLA dry is crucial for achieving the best results. Implement these tips today to elevate your printing experience and create amazing projects with confidence.
If you have any questions or tips of your own, feel free to share them in the comments below. And don’t forget to subscribe to our blog for more 3D printing insights and updates.
FAQs
Can you use silica gel to dry filament?
Yes, silica gel can help keep filament dry, though it’s primarily used for preventing moisture rather than drying filament that has already absorbed water.
How to keep PLA filament dry?
Use airtight containers or vacuum-sealed bags with silica gel packets to keep PLA filament dry. Store in a cool, dry environment.
Does silica gel keep things dry?
Yes, silica gel acts as a desiccant, absorbing moisture from the air and helping maintain a dry environment.
Does PLA get brittle with moisture?
Yes, moisture can make PLA brittle by causing hydrolysis, which weakens the polymer chains and affects the material’s strength.