Touch-n-Go: Designing and Fabricating Touch Fastening Structures by FDM 3D Printing

Title of the Paper

Touch-n-Go: Designing and Fabricating Touch Fastening Structures by FDM 3D Printing

Paper Information

• Research Area: Design of rapid connection/disassembly structures and 3D printing technology
• Keywords: 3D printing, personal fabrication, parametric modeling, surface adhesion, design tools

Research Background and Problems

• Research Problems or Challenges:

  • Touch fastening structures (e.g., Velcro) are widely used for temporary connections and disassembly, but their application in personalized additive manufacturing is limited.
  • Existing studies primarily focus on embedding existing fastening structures, without exploring the contours, patterns, and design space of printable fastening units.
  • Designing efficient, dynamically customizable fastening systems based on 3D printing remains an unresolved challenge.

• Significance:

  • Providing flexible, reusable, and highly customizable connection methods suitable for multiple application scenarios (e.g., apparel, medical devices, aerospace).
  • Current market solutions like Velcro and multi-lock structures are manufactured through complex production processes, while personal fabrication users require more convenient and efficient solutions.

• Research Motivation and Related Work:

  • Inspired by existing fastening methods, digital fabrication technologies, and community attempts to address touch fastening structures.
  • Aiming to solve the lack of flexible design and widespread use of touch fastening structures through personalized design and additive manufacturing.

Solution

• Methods or Solutions:
  The authors propose a design and fabrication system called “Touch-n-Go,” which utilizes FDM 3D printing technology to directly generate touch fastening structures on object surfaces. The system includes:

  1. Experimental analysis to design the geometric contours and patterns of fastening units.
  2. A design tool that allows users to adjust non-static and dynamic connection structures based on specific needs.
  3. Validation of the design principles through rapid assembly and disassembly functionalities.

• Innovations:

  • Expanding the design space for 3D-printed touch fastening structures, including fastening unit contours, dynamic patterns, and movable component designs.
  • Adding fastening strength evaluation and multiple interaction modes to the design tool, enabling user-customized designs.
  • Addressing limitations of existing solutions, such as face-to-face connections and dynamic adjustments.

• Implementation Steps and Key Technologies:

  1. Structure Design: Defining unit contours (extrusion units and tapered units) and patterns (static and dynamic modes) to support multi-directional connections and movement.
  2. Experimental Validation: Analyzing factors related to fastening characteristics through load force, holding force, shear force experiments, and durability studies.
  3. Tool Development: Developing a design tool based on Rhinoceros and Grasshopper, allowing users to import models, customize fastening units, and generate printable designs.
  4. Application Demonstration: Implementing Touch-n-Go in various scenarios (e.g., aesthetic decorations, interactive devices, wearable devices).

Research Results

• Specific Results:

  • Proposed multiple touch fastening unit contours (e.g., cylindrical units, angled units, groove-shaped units) and systematically classified and parameterized them.
  • Experimental validation showed superior fastening performance compared to commercial products (e.g., VELCRO brand Velcro), including holding force and shear force.
  • Developed an easy-to-use design tool that enhances users’ ability to directly generate fastening structures and dynamically adjust them within 3D models.

• Advantages:

  • Enables rapid temporary connection and disassembly of target objects.
  • Supports dynamic multi-directional movement connections (e.g., rotation, linear movement) in addition to static connections.
  • Offers rich and flexible customization options, adapting to various object surfaces with high compatibility.

• Experimental or Evaluation Results:

  • Height and diameter influence fastening force: cylindrical units with a height of 4.8 mm and a diameter of 1.6 mm achieved a holding force of 77 N.
  • Angled units enhanced shear force: maximum shear force increased to 133 N, introducing anisotropic connections.
  • Durability tests showed fastening force stabilized after initial cycles, maintaining acceptable performance over 300 cycles.

• Limitations and Future Directions:

  • Limitations:
    • Limited compatibility with curved surfaces; current solutions use coarse processing for non-planar surfaces.
    • Unit size constrained by the minimum line width of FDM printing technology (approximately 0.8 mm diameter).
    • Segmentation and reassembly of significantly complex models require manual intervention.
  • Future Directions:
    • Improve compatibility with complex curved and non-planar surfaces.
    • Explore other types of structures based on FDM printing (e.g., hook-and-loop fastening units).
    • Develop automated model segmentation tools to optimize design and reduce printing support structures.

Conclusion

The authors propose an innovative design and fabrication system that generates touch fastening structures through 3D printing, significantly enhancing the flexibility and functionality of personalized connection designs. This study not only validates the design principles and system performance but also demonstrates its broad application potential, particularly in personal fabrication and interactive product domains. It also provides guidance for future research aimed at further optimization and expansion.