Zip-up Print: Rapid and Assemblable 3D printing Using 2D Flattened Zipper-like Structures

Paper Title

Zip-up Print: Rapid and Assemblable 3D printing Using 2D Flattened Zipper-like Structures

Publication Info

• Topic area: Computational design and fabrication for 3D printing
• Keywords: 3D printing, developable surfaces, zipper structures, fabrication pipeline, support material reduction, assembly, modular design, computational geometry, rapid prototyping, user interaction

Background and Problem

• Problem / challenge: Conventional 3D printing faces challenges such as high support material consumption, long printing times, limited build volumes, and inefficiency in modifying or replacing parts of printed objects. Existing solutions like flattening or dividing objects have limitations in terms of geometric fidelity, material savings, and ease of assembly/disassembly.
• Significance: Addressing these challenges can make 3D printing more efficient, cost-effective, and accessible for fabricating complex or large-scale objects while enabling iterative modifications.
• Motivation and related work: Prior work has explored flattening for 4D printing, dividing objects into components, and using zipper-like connectors. However, these approaches often lack full automation, support-less fabrication, or the ability to handle arbitrary 3D models. This paper builds on these methods to propose a more versatile and efficient solution.

Solution

• Proposed approach: Zip-up Print, a computational pipeline that converts 3D models into developable patches with integrated zipper-like structures for flattened 3D printing and manual assembly.
• Novelty:
  1. A 3D printable zipper structure with ball-and-socket geometry for angle-independent connections and support-less fabrication.
  2. An automated pipeline for segmenting 3D models into developable patches, generating zipper structures, and flattening them for printing.
  3. Demonstration of reduced fabrication time, material consumption, and the ability to fabricate objects larger than the printer’s build volume.
• Procedure and key techniques:
  1. Convert 3D models into developable patches using Zhao et al.'s method.
  2. Allow user-defined seams for further segmentation of oversized patches.
  3. Generate zipper structures along patch boundaries using ball-and-socket geometry to enable angle-independent connections.
  4. Flatten patches with integrated zippers for 2D printing.
  5. Assemble printed patches manually to reconstruct the 3D object.

Results

• Concrete findings:
  • Structural error between fabricated and developable models averaged 3.77%, with surface coverage exceeding 98% for all models.
  • Support material consumption reduced by an average of 78.65%, and total material consumption decreased by 77.43% compared to conventional 3D printing.
  • Fabrication time reduced by 44.4% on average, including assembly time.
• Advantage over baselines:
  • Significant reductions in support material and fabrication time compared to conventional 3D printing.
  • Ability to fabricate objects larger than the printer’s build volume.
  • Reversible assembly and disassembly for iterative modifications.
• Experiments / evaluation:
  • Tested on six models (e.g., Stanford Bunny, bird, Moai statue) with diverse geometries.
  • Mechanical tests showed scaling zipper size increases holding forces, and durability tests confirmed stable performance after 200 assembly cycles.
  • User study with five participants highlighted enjoyable assembly but noted challenges with the final patch.
• Limitations and future work:
  • Holes at branching points of zippers reduce surface completeness.
  • Current developable approximation may produce excessive patches, complicating assembly.
  • Further optimization needed for zipper-specific developable approximation, dynamic tooth density, and automated assembly order visualization.
  • Potential for integrating pyramidal zipper geometries and parallel printing with multiple printers.

Summary

Zip-up Print introduces a novel pipeline for fabricating 3D objects by printing flattened developable patches with integrated zipper-like structures. The approach reduces support material consumption by 78.65% and fabrication time by 44.4% while enabling the assembly of objects larger than the printer’s build volume. The ball-and-socket zipper design allows for reversible assembly and angle-independent connections. Applications include customizable objects, modular designs, and hybrid fabrication with conventional 3D printing. Future work aims to refine developable approximations, improve assembly processes, and explore parallel printing.