Introduction
Choosing the right Conductive PLA or ABS filament is critical for your next electronics project.
For years, 3D printing with conductive materials was a battle against the material itself. Engineers who needed ESD-safe fixtures or EMI shielding often felt forced to use Conductive ABS because it was the “industry standard” for durability. However, they paid the price in warped parts, toxic fumes, and failed prints.
Fortunately, the landscape has changed. Modern material science has finally closed the gap.
Today, high-performance Conductive PLA—especially those enhanced with Carbon Nanotubes (CNTs)—offers a compelling alternative that outperforms ABS in printability while matching its electrical properties. Therefore, if you are designing custom circuits, sensors, or manufacturing jigs, here is why you might want to rethink your material choice.
1. The Dealbreaker: Printability of Conductive PLA vs. ABS
The biggest difference between these two materials isn’t conductivity; it’s successful printing.
Conductive ABS is notoriously difficult to print. It has a high shrinkage rate, which leads to warping (lifting off the print bed) and delamination (layers splitting apart). To print it successfully, you generally need:
- A fully enclosed, heated chamber.
- High bed temperatures (100°C+).
- Adhesives like slurry or Kapton tape.
Conductive PLA, on the other hand, retains the ease of use of standard PLA. It prints at lower temperatures, adheres well to standard print beds (PEI or glass), and has almost zero warping. Consequently, this means you can produce complex, dimensionally accurate fixtures on a standard desktop 3D printer without an industrial enclosure.
Winner: Conductive PLA (by a landslide).
2. Electrical Performance: One Size Does Not Fit All
A common misconception is that a filament is either “conductive” or “not.” However, in professional electronics, specificity matters. You don’t just need conductivity; you need the right level of resistivity for your specific application.
At ABC3D, we engineer our materials to meet precise industrial standards. Unlike generic conductive filaments, our Conductive PLA is available in three distinct grades to match your project needs:
- Antistatic Grade: Ideal for dust prevention and low-level static control.
- Electrostatic Discharge (ESD) Grade: The standard for manufacturing fixtures. It safely drains static charges (10^6 to 10^9 ohms) without causing a spark that could damage sensitive electronics.
- EMI / RFI Shielding Grade: Highly conductive (low resistivity) material designed to block electromagnetic interference or radio frequency interference in enclosures.
Conductive ABS can achieve these ranges too, but the conductive filler (often Carbon Black) can make the ABS even more brittle. Furthermore, because our PLA uses advanced Carbon Nanotubes (CNTs), we can achieve these conductivity levels with lower filler loading, preserving the strength of the plastic.
Winner: Tie (Performance depends on the filler, but PLA offers better mechanical retention).
3. Thermal vs. Mechanical Strength
This is the one area where ABS historically holds the edge.
- Heat Resistance: ABS has a higher Heat Deflection Temperature (HDT). If your part is going inside a car engine bay or a high-temperature sterilization environment (above 85°C), ABS is the better choice. Conductive PLA will soften at temperatures above 60°C unless it is a specialized high-temp blend.
- Stiffness & Tensile Strength: Surprisingly, PLA is actually stiffer and stronger than ABS. ABS is more ductile (it bends before it breaks), while PLA is more rigid. For jigs and fixtures that need to hold a circuit board firmly in place without flexing, PLA’s rigidity is actually an advantage.
Winner: ABS for high heat; PLA for room-temperature strength and rigidity.
4. Sustainability and Safety of Conductive PLA
In a modern lab or office environment, safety is paramount.
Printing ABS releases Styrene, a known carcinogen and respiratory irritant. It requires active ventilation or air filtration systems. In contrast, Conductive PLA is a bio-based plastic derived from renewable resources (like corn starch or sugarcane). It produces little to no odor and does not release toxic styrene fumes, making it safe for use in open office environments or schools.
Winner: Conductive PLA.
Conclusion: Which Should You Choose?
For 90% of electronics projects—including enclosures, low-voltage circuits, capacitive touch sensors, and assembly line ESD fixtures—Conductive PLA is the superior choice.
It delivers the reliable electrical properties you need without the frustration of failed prints and warped corners. Unless your part requires resistance to temperatures above 60°C, the ease of use and dimensional accuracy of PLA make it the engineer’s favorite.
Ready to start printing? Explore our full range of specialized conductive materials, engineered right here in Canada.