The Robot Report

  • Home
  • News
  • Technologies
    • Batteries / Power Supplies
    • Cameras / Imaging / Vision
    • Controllers
    • End Effectors
    • Microprocessors / SoCs
    • Motion Control
    • Sensors
    • Soft Robotics
    • Software / Simulation
  • Development
    • Artificial Intelligence
    • Human Robot Interaction / Haptics
    • Mobility / Navigation
    • Research
  • Robots
    • AGVs
    • AMRs
    • Consumer
    • Collaborative Robots
    • Drones
    • Exoskeletons
    • Industrial
    • Self-Driving Vehicles
    • Unmanned Maritime Systems
  • Markets
    • Agriculture
    • Healthcare
    • Logistics
    • Manufacturing
    • Mining
    • Security
  • Financial
    • Investments
    • Mergers & Acquisitions
    • Earnings
  • Resources
    • Careers
    • COVID-19
    • Digital Issues
    • Publications
      • Collaborative Robotics Trends
      • Robotics Business Review
    • RBR50 Winners 2022
    • Search Robotics Database
    • Videos
    • Webinars / Digital Events
  • Events
    • RoboBusiness
    • Robotics Summit & Expo
    • Healthcare Robotics Engineering Forum
    • DeviceTalks
    • R&D 100
    • Robotics Weeks
  • Podcast
    • Episodes
    • Leave a voicemail

Soft pneumatic actuators could get smaller with high-res 3D printing process

By The Robot Report Staff | September 1, 2019

Soft pneumatic actuators could get smaller with high-res 3D printing process

Researchers have proposed a process flow to guide the 3D printing of miniature soft pneumatic actuators that are smaller than a coin. A soft debris remover with an integrated miniature gripper can navigate through confined spaces and collect small objects in hard-to-reach positions. Source: Singapore University of Technology and Design

Soft robots are a class of robotic systems made of compliant materials and capable of safely adapting to complex environments. They have seen rapid growth recently and come in a variety of designs spanning multiple length scales, from meters to submicrometers. In particular, small robots at millimeter scale can be designed as a combination of miniature soft pneumatic actuators. They are also well suited for navigation in confined areas and manipulation of small objects.

However, scaling down pneumatic actuators to millimeters results in finer features that are reduced by more than one order of magnitude. The design complexity of such robots demands great delicacy when they are fabricated with traditional processes such as molding and soft lithography. Although emerging 3D printing technologies like digital light processing (DLP) offer high theoretical resolutions, dealing with microscale voids and channels without causing clogging has still been challenging. Indeed, successful examples of 3D printing miniature soft pneumatic actuators are rare.

Recently, researchers from Singapore and China, namely from the Singapore University of Technology and Design (SUTD), Southern University of Science and Technology (SUSTech), and Zhejiang University (ZJU), proposed a generic process flow for guiding DLP 3D printing of miniature pneumatic actuators for soft robots with overall size of 2-15 mm and feature size of 150-350 μm\. Their research was published in Advanced Materials Technologies.

3D printing enables microscale soft pneumatic actuators

“We leveraged the high efficiency and resolution of DLP 3D printing to fabricate miniature soft robotic actuators,” said Qi (Kevin) Ge, an associate professor at SUSTech and lead researcher of the research project. “To ensure reliable printing fidelity and mechanical performance in the printed products, we introduced a new paradigm for systematic and efficient tailoring of the material formulation and key processing parameters.”

In DLP 3D printing, photo-absorbers are commonly added into polymer solutions to enhance the printing resolutions in both lateral and vertical directions. Meanwhile, overly increasing the dose leads to rapid degradation in the material’s elasticity, which is crucial for soft robots to sustain large deformations.

“To achieve a reasonable trade-off, we first selected a photo-absorber with good absorbance at the wavelength of the projected UV light and determined the appropriate material formulation based on mechanical performance tests,” explained co-first author Yuan-Fang Zhang from SUTD. “Next, we characterized the curing depth and XY fidelity to identify the suitable combination of exposure time and sliced layer thickness.”

“By following this process flow, we are able to produce an assortment of miniature soft pneumatic robotic actuators with various structures and morphing modes, all smaller than a one Singapore Dollar coin, on a self-built multimaterial 3D printing system,” said corresponding author Qi Ge. “The same methodology should be compatible with commercial stereolithography (SLA) or DLP 3D printers as no hardware modification is required.”


The Robot Report has launched the Healthcare Robotics Engineering Forum, which will be on Dec. 9-10 in Santa Clara, Calif. The conference and expo focuses on improving the design, development and manufacture of next-generation healthcare robots. Learn more about the Healthcare Robotics Engineering Forum.


Potential applications

To exemplify the potential applications, the researchers also devised a soft debris remover comprising a continuum manipulator and a 3D printed miniature soft pneumatic gripper. It can navigate through a confined space and collect small objects in hard-to-reach positions.

The proposed approach paves the way for 3D printing miniature soft robots with complex geometries and sophisticated multimaterial designs. This integration of printed miniature soft pneumatic actuators into a robotic system offers opportunities for potential applications such as jet-engine maintenance and minimally invasive surgery.

Tell Us What You Think! Cancel reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Related Articles Read More >

gripper holding a mason jar
MIT CSAIL develops robotic gripper that can feel what it grabs
active matter
Researchers aim to create soft, shape-changing robots
Tiny Robot
Soft actuators help MIT power nano drones
NCSU researchers make faster thermal actuator

2021 Robotics Handbook

The Robot Report Listing Database

Latest Robotics News

Robot Report Podcast

Anders Beck introduces the UR20; California bans autonomous tractors
See More >

Sponsored Content

  • Magnetic encoders support the stabilization control of a self-balancing two-wheeled robotic vehicle
  • How to best choose your AGV’s Wheel Drive provider
  • Meet Trey, the autonomous trailer (un)loading forklift
  • Kinova Robotics launches Link 6, the first Canadian industrial collaborative robot
  • Torque sensors help make human/robot collaborations safer for workers

RBR50 Innovation Awards

Leave us a voicemail

The Robot Report
  • Mobile Robot Guide
  • Collaborative Robotics Trends
  • Field Robotics Forum
  • Healthcare Robotics Engineering Forum
  • RoboBusiness Event
  • Robotics Business Review
  • Robotics Summit & Expo
  • About The Robot Report
  • Subscribe
  • Advertising
  • Contact Us

Copyright © 2022 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search The Robot Report

  • Home
  • News
  • Technologies
    • Batteries / Power Supplies
    • Cameras / Imaging / Vision
    • Controllers
    • End Effectors
    • Microprocessors / SoCs
    • Motion Control
    • Sensors
    • Soft Robotics
    • Software / Simulation
  • Development
    • Artificial Intelligence
    • Human Robot Interaction / Haptics
    • Mobility / Navigation
    • Research
  • Robots
    • AGVs
    • AMRs
    • Consumer
    • Collaborative Robots
    • Drones
    • Exoskeletons
    • Industrial
    • Self-Driving Vehicles
    • Unmanned Maritime Systems
  • Markets
    • Agriculture
    • Healthcare
    • Logistics
    • Manufacturing
    • Mining
    • Security
  • Financial
    • Investments
    • Mergers & Acquisitions
    • Earnings
  • Resources
    • Careers
    • COVID-19
    • Digital Issues
    • Publications
      • Collaborative Robotics Trends
      • Robotics Business Review
    • RBR50 Winners 2022
    • Search Robotics Database
    • Videos
    • Webinars / Digital Events
  • Events
    • RoboBusiness
    • Robotics Summit & Expo
    • Healthcare Robotics Engineering Forum
    • DeviceTalks
    • R&D 100
    • Robotics Weeks
  • Podcast
    • Episodes
    • Leave a voicemail