Short answer
Prioritize sheet lamination additive manufacturing (CBAM) over extrusion-based methods (FDM) when producing fiber-reinforced thermoplastic composites where material integrity, fiber content, and low porosity are critical for performance.
- Field
- Commercial Production
- Source
- SAMPE JOURNAL (2025)
- Method
- Comparative Microstructural Analysis
- Evidence
- Strong effect
Sheet lamination-based additive manufacturing (CBAM) yields thermoplastic composites with higher fiber volume fraction and lower, more uniform porosity compared to extrusion-based methods (FDM). This commercial production research insight is drawn from a 2025 study published in SAMPE JOURNAL. Using Comparative microstructural analysis, researchers explored how this design variable affects real-world outcomes. The key design takeaway: Prioritize sheet lamination additive manufacturing (CBAM) over extrusion-based methods (FDM) when producing fiber-reinforced thermoplastic composites where material integrity, fiber content, and low porosity are critical for performance.
Sheet Lamination AM Outperforms Extrusion AM in Composite Material Integrity
Sheet lamination-based additive manufacturing (CBAM) yields thermoplastic composites with higher fiber volume fraction and lower, more uniform porosity compared to extrusion-based methods (FDM).
SAMPE JOURNAL · 2025
Key Findings
- 01CBAM specimens exhibited a higher fiber volume fraction (Vf) compared to FDM specimens.
- 02CBAM specimens demonstrated lower overall porosity.
- 03Pores in CBAM specimens were smaller and more randomly distributed, often closed, whereas FDM pores were larger and more varied.
- 04Printing orientation in FDM (flatwise vs. edgewise) affected porosity, with edgewise showing higher porosity due to a greater number of sheets.
Application
Design takeaway
Prioritize sheet lamination additive manufacturing (CBAM) over extrusion-based methods (FDM) when producing fiber-reinforced thermoplastic composites where material integrity, fiber content, and low porosity are critical for performance.
How to apply
When designing composite parts using additive manufacturing, evaluate the trade-offs between FDM and CBAM based on the critical performance requirements for fiber reinforcement and void content. Consider CBAM for demanding applications.
Project actions
- 01When choosing a manufacturing method for your design, consider how it affects the material's internal structure.
- 02Investigate how different printing orientations can impact the quality and performance of 3D printed parts.
Method & Evidence
Variables
Strengths & Limitations
Strengths
- +Direct comparison of two prominent AM techniques for composites.
- +Detailed microstructural analysis including porosity quantification.
Limitations
The study might not cover all types of fiber-reinforced composites or all variations of FDM and CBAM. The long-term durability of parts made by each method was not assessed.
Reliability & validity
The study's reliability is supported by detailed microstructural characterization. Validity is enhanced by comparing two distinct AM processes, but may be limited by the specific material and equipment used.
Think critically
To what extent do the observed microstructural differences translate into macroscopic performance improvements in real-world applications, and how might these differences affect the design's lifespan?
Design Principles
"Process selection for additive manufacturing of composites should be guided by the desired material properties, with sheet lamination offering advantages in fiber volume fraction and porosity control."
This finding is critical for designers and engineers selecting manufacturing processes for composite parts. CBAM's superior material integrity suggests enhanced mechanical performance and reliability, potentially enabling the production of more robust and complex components at scale.
What This Means for Your Design
One way to 3D print with strong materials is using a method that layers sheets of material (like CBAM), which makes the final part stronger and have fewer air bubbles than a method that pushes melted plastic through a nozzle (like FDM).
How to use in your project
- 1.Reference this study when justifying the selection of a specific additive manufacturing technique for composite materials in your design project, highlighting the benefits of CBAM for material integrity.
Add to My Project
Quick Cite
Paragraph starter
The comparative analysis of sheet lamination (CBAM) and material extrusion (FDM) additive manufacturing techniques for thermoplastic composites reveals significant differences in material integrity. CBAM consistently yielded higher fiber volume fractions and lower, more uniform porosity, suggesting superior mechanical performance and reliability compared to FDM. This distinction is critical for designers selecting manufacturing processes for demanding composite applications.
Source
SAMPE JOURNAL
Microstructural Characterization and Porosity Analysis in Sheet Lamination and Material Extrusion-Based Additively Manufactured Thermoplastic Composites
journal · 2025
View sourceQuestions About This Research
- What does the research say about sheet lamination am outperforms extrusion am in composite material integrity?
- Prioritize sheet lamination additive manufacturing (CBAM) over extrusion-based methods (FDM) when producing fiber-reinforced thermoplastic composites where material integrity, fiber content, and low porosity are critical for performance. Evidence: SAMPE JOURNAL (2025).
- Why does "Sheet Lamination AM Outperforms Extrusion AM in Composite Material Integrity" matter for design?
- This finding is critical for designers and engineers selecting manufacturing processes for composite parts. CBAM's superior material integrity suggests enhanced mechanical performance and reliability, potentially enabling the production of more robust and complex components at scale.
- How can designers apply this research?
- Prioritize sheet lamination additive manufacturing (CBAM) over extrusion-based methods (FDM) when producing fiber-reinforced thermoplastic composites where material integrity, fiber content, and low porosity are critical for performance.
- What were the main findings?
- CBAM specimens exhibited a higher fiber volume fraction (Vf) compared to FDM specimens.. CBAM specimens demonstrated lower overall porosity.. Pores in CBAM specimens were smaller and more randomly distributed, often closed, whereas FDM pores were larger and more varied.. Printing orientation in FDM (flatwise vs. edgewise) affected porosity, with edgewise showing higher porosity due to a greater number of sheets.
- What research method was used?
- Comparative Microstructural Analysis.
- How strong is the evidence?
- Evidence strength is rated Strong effect, based on a 2025 journal from SAMPE JOURNAL.
- What should I do differently in my next project?
- When designing composite parts using additive manufacturing, evaluate the trade-offs between FDM and CBAM based on the critical performance requirements for fiber reinforcement and void content. Consider CBAM for demanding applications.
- What are the limitations?
- The study focused on a specific composite material (CF-PA12) and two AM techniques; results may vary with different materials or processes. The influence of post-processing steps was not detailed.