Architected Vacuum Driven Origami Structures Via Direct Ink Writing of RTV Silicone
Qiyao Wang, Thileepan Stalin, Pablo Valdivia y Alvarado
AI summary
Problem
Fabricating programmable, vacuum-actuated origami from soft elastomers remains challenging due to manual folding requirements and the lack of streamlined design-to-print workflows for integrated pneumatic channels.
Approach
The authors introduce a geometric hinge design library and a custom Python tool that automatically generates optimized G-code for Direct Ink Writing, allowing users to define origami parameters and print monolithic or assembled silicone structures with reliable vacuum-driven folding.
Key results
- Flexible hinge library enabling controlled 45° to 90° vacuum-driven bending
- Automated Python tool that cuts design-to-fabrication time by generating optimized DIW G-code
- Successful 3D printing of complex origami prototypes via both multi-step assembly and single-step gel-supported methods
- Demonstrated rapid, synchronized actuation in multi-hinge structures like origami cubes and flapping birds
Why it matters
Provides a scalable, automated workflow for creating soft robotic actuators and deployable systems, accelerating the transition from origami theory to functional silicone devices.
Abstract
Recent advances in soft robotics, wearable devices, and deployable systems have sparked tremendous interest in origami structures due to their controllable volume changes and shape-morphing capabilities. Despite significant progress in the design and fabrication of origami using traditional materials such as paper, textiles, thermoplastics, and thick panels, challenges persist in creating soft elastomeric origami designs that allow for precise, programmable deformations. This work proposes an architected approach for designing and 3D printing Room Temperature Vulcanization (RTV) silicone-based origami structures actuated by negative pressure. Central to this approach is a flexible hinge design, which enables controlled bending angles ranging from 45° to 90° upon the application of vacuum actuation. This architected method simplifies the complex folding of origami structures by strategically arranging the flexible hinges. A Python-based software tool was developed to generate custom G-code directly from user-defined design parameters, streamlining the design-to-fabrication pipeline for Direct Ink Writing (DIW) RTV silicone-based origami parts. Initial fabrication experiments were conducted using a three-step print-assemble-bond approach. As an alternative to eliminating manual processing steps, a monolithic flexible hinge with a cavity was printed within a gel support. This paper introduces a hinge design library and discusses the design-to-fabrication workflow for origami-inspired active structures.