Pellet-based additive manufacturing is commonly known for its intrinsic challenges for controlling the flow behaviour of various thermoplastics, which usually results in a compromise between efficiency and precision. This is amplified with complex geometries, resulting in inconsistent layers, warping or poor visual quality.

Released by Polymaker in November 2025 at Formnext, PolyCore™ PETG-1312, a 20% glassfiber reinforced PETG, engineered to balance high melt throughput with controlled flow behavior and deliver reliable printing of complex geometries, while remaining compatible across both medium-format and large-format additive manufacturing systems.

Figure 1 | PETG-1312 pellets and printed chess pieces by Ginger Additive

Medium-format additive manufacturing (MFAM), also known as MAAM (Medium-Area Additive Manufacturing) or mid-scale pellet printing, refers to pellet extrusion systems that typically operate with 1–4 mm nozzle diameters, throughputs around 1–2 kg/h, and build volumes of roughly 1 m³. Positioned between desktop FDM and large-format additive manufacturing (LFAM), MFAM enables greater geometric freedom, frequent retractions, and extensive use of support structures.

PolyCore™ PETG-1312 further unlocks the potential of MFAM systems with its optimized flow control - meeting the requirements of  various MFAM technologies, whilst maintaining the throughput and stability needed for LFAM.

Printability: Productivity and Detail, Achieved Together

• Clean Retraction for Complex Geometry: Optimized material flow (melt rheology) that greatly reduces stringing and oozing and ensures the reliable printing of fine features and complex support structures. Resulting in more reliable printing of complex geometries with minimal tuning, along with a smoother, more uniform surface finish straight off the printer.

Figure 2 | Retraction performance of PETG-1312 during printing

• Minimal Warping for Large Parts: Warping is reduced by nearly 50%[1] compared to non-reinforced ABS or PETG, supporting dimensional stability across various printing environments. This allows users to print larger parts with confidence and improved accuracy, reducing rework and assembly issues.
• Wide Printing Window: Stable flow across a broad range of layer times and high print speeds supports efficient production without sacrificing detail resolution or overall print quality.

Figure 3 | Sculptures printed with PETG-1312 by Shanzao

Functionality: Built for Real Applications

• Toughness + Heat-Resistance: Maintains comprehensive mechanical properties, especially toughness at service temperatures up to ~70°C, enabling consistent mechanical performance under typical functional operating conditions.

• Post-Processing Friendly: Parts sand smoothly and CNC machine cleanly, resulting in ~2.8×[2] higher finishing efficiency compared to common alternatives. Featuring a strong adhesion to putty, primers, and coatings, downstream processes such as mold finishing, painting, and large-scale artistic post-processing are also streamlined.

PolyCore™ PETG-1312 has been validated on a growing range of companies, including MFAM systems from Aura3D, Ginger Additive, Kings 3D, Piocreat and Shanzao, where it has earned broad recognition for its balanced performance and reliability.

Figure 4 | Validated system partners for PolyCore™ PETG-1312

With its strong performance-to-cost ratio, PETG-1312 supports a wide range of applications, including large-scale artworks and sculptures, sand-casting patterns and industrial tooling, and other complex functional parts.

Partner Voice

Ginger Additive is an Italian-based developer of pellet extrusion systems. In collaboration with Polymaker, the Ginger Additive team validated PolyCore™ PETG-1312 on the G1 system and developed dedicated print presets to support stable flow and clean retraction with minimal tuning.

“Polymaker’s PolyCore™ PETG-1312 demonstrates very good retraction performance with our G1 system. Alongside the formulation’s exceptional printability for complex and detailed geometries, this material’s performance is the last step to ensure pellet-based additive manufacturing printing will be as accessible as FDM.” — Rouven Jost from Ginger Additive

Figure 5 | Chess pieces printed with PETG-1312 by Ginger Additive

Request a Free Sample of PolyCore™ PETG-1312 pellets (not filament).

Validated print presets developed for leading MFAM systems are available alongside sample requests, supporting your first-time print success.

📩 For requests, product details, or orders, contact:

[email protected]

[1] Based on Polymaker’s internal warping test method.

[2] Based on Polymaker's internal post-processing efficiency test method.