Recycled and Biodegradable Filaments Drive Next-Gen 3D Printing

Why It Matters

As designers and engineers increasingly utilize 3D printing for prototyping and production, understanding material limitations and opportunities is crucial. This research highlights a significant gap in real-world applications and points towards the development of sustainable materials as a key area for innovation and market differentiation.

Key Finding

The review found that while reinforced polymers are enhancing 3D-printed parts, there's a lack of standardized processes and real-world applications. Future research should focus on recycling, biodegradable materials, and 4D printing to advance the field.

Key Findings

• Customized filaments are more prevalent than commercially available ones.
• Particulate matter is the most common filler type.
• Polyamide, PLA, and ABS are the most used polymer matrices.
• Carbon fiber, glass fiber, and ceramics are the most frequent reinforcements.
• No standardized protocols exist for the entire process from feedstock formulation to prototype fabrication.
• Current applications are not yet employed in real-world scenarios.
• Recycling, biodegradable materials, and 4D printing are key opportunities for future research.

Research Evidence

Aim: To systematically review the current state of polymeric composites in material extrusion additive manufacturing, identify limitations, and explore future research trends, particularly in sustainable material development.

Method: Systematic Review

Procedure: The researchers followed the PRISMA statement, consulting Scopus, Web of Science, and PubMed databases to analyze 116 studies on polymeric composites in additive manufacturing. They categorized matrices, reinforcing materials, feedstock shapes, characterization methods, and extrusion mechanisms, while also identifying applications, limitations, and future trends.

Sample Size: 116 studies

Context: Material Extrusion Additive Manufacturing (3D Printing)

Design Principle

Embrace circular economy principles in material selection for additive manufacturing by prioritizing recycled and biodegradable composites.

How to Apply

When selecting materials for a design project involving 3D printing, actively research and consider filaments made from recycled plastics or biodegradable polymers. Document the challenges and benefits encountered during material processing and testing.

Limitations

The review did not identify any applications currently used in real-world scenarios, suggesting a gap between research and practical implementation.

Student Guide (IB Design Technology)

Simple Explanation: 3D printing is getting better with new materials, but the best future materials will be ones that are recycled or can break down naturally. There's no single 'best way' to make these materials yet, and they aren't used in real products much, but this is where designers should focus their efforts.

Why This Matters: Understanding the evolution of materials in 3D printing, especially the push towards sustainability, is vital for creating innovative and responsible designs that align with future market demands and environmental concerns.

Critical Thinking: Given the identified lack of standardized protocols and real-world applications, how can a designer effectively mitigate risks and ensure the reliability of a product developed using novel recycled or biodegradable composite filaments?

IA-Ready Paragraph: This research highlights a significant trend towards sustainable materials in additive manufacturing, with future opportunities identified in the use of recycled and biodegradable composite feedstocks. As current applications are not yet in real-world scenarios and standardized protocols are lacking, designers have a critical role in exploring and validating these materials for practical use, aligning design projects with environmental responsibility and future market demands.

Project Tips

• Investigate commercially available recycled or biodegradable filaments for your design project.
• Document the challenges and successes of working with these novel materials.
• Consider how the material choice impacts the product's lifecycle, including end-of-life options.

How to Use in IA

• Cite this review when discussing material selection, particularly if exploring sustainable options for your design project.
• Use the findings on common matrices and reinforcements to inform your material choices or to justify the selection of less common but more sustainable alternatives.

Examiner Tips

• Demonstrate an awareness of current material trends in additive manufacturing, particularly the growing importance of sustainability.
• Critically evaluate the limitations of current materials and propose innovative solutions, referencing research on biodegradable or recycled options.

Independent Variable: Material type (recycled, biodegradable, standard composite)

Dependent Variable: Printability, mechanical properties, surface finish, environmental impact

Controlled Variables: 3D printer model, extrusion temperature, print speed, infill density

Strengths

• Comprehensive systematic review covering a broad range of studies.
• Quantification and categorization of key aspects of composite material extrusion additive manufacturing.

Critical Questions

• What are the specific challenges in scaling up the production of customized recycled or biodegradable filaments?
• How can the performance of biodegradable composites be improved to match or exceed that of traditional petroleum-based plastics for demanding applications?

Extended Essay Application

• An Extended Essay could investigate the mechanical properties of a specific recycled polymer composite filament compared to its virgin counterpart, analyzing its suitability for a particular product design.
• Another EE could explore the life cycle assessment of a 3D-printed object made from biodegradable materials versus a traditionally manufactured equivalent.

Source

Polymeric composites in extrusion‐based additive manufacturing: a systematic review · Polymer Composites · 2024 · 10.1002/pc.28269