NTU Morphing Gripper: Nature Publication on Compliant Tech Revolutionizing Vertical Farming in Singapore

Singapore's Vertical Farming Boom and the Harvesting Hurdle

Singapore, a city-state with virtually no arable land, imports over 90 percent of its food supply, making food security a national priority. To counter this, the government launched the '30 by 30' initiative, aiming to produce 30 percent of its nutritional needs locally by 2030 through innovative methods like vertical farming. These multi-story, controlled-environment farms stack crops in layers, using hydroponics or aeroponics to maximize yield per square foot. Companies like Sky Greens, ComCrop, and the newly opened Greenphyto—the world's tallest indoor vertical farm at 23 meters—produce thousands of tons of leafy greens annually, such as lettuce, spinach, and bok choy.

Yet, a critical bottleneck persists: harvesting. Delicate leafy vegetables grow densely packed, with narrow gaps between plants, and bruise easily under pressure. Manual labor remains dominant, driving up costs and limiting scalability in a high-wage economy like Singapore's. 80 119

NTU's Breakthrough: A Compliant Morphing Gripper Enters the Scene

Researchers at Nanyang Technological University (NTU) Singapore have unveiled a game-changing solution: a compliant, morphing gripper detailed in a fresh publication in Scientific Reports, part of the Nature portfolio. This two-finger pinching gripper features innovative fingertips that adapt on the fly, collapsing to slip into tight spaces, expanding for gentle contact, and reconfiguring to match irregular plant shapes before securing a firm hold.

Led by Professor Soo Jay Phee from NTU's School of Mechanical and Aerospace Engineering, the team—including Jiajun Liu, Xing Yu Chen, Huu Duoc Nguyen, Wenjie Lai, and Joel Ming Rui Tan—developed the device under the Smart Grippers for Soft Robotics (SGSR) program, a Campus for Research Excellence and Technological Enterprise (CREATE) collaboration with Hebrew University and SUTD. 80 90

How the Morphing Gripper Works: Engineering Compliant Fingertips

The gripper's magic lies in its 3D-printed fingertips, fabricated using polylactic acid (PLA) rigid structures combined with flexible Filaflex-60A thermoplastic polyurethane (TPU). This hybrid design enables passive compliance—no complex actuators needed. When approaching a plant, the fingertips compress to a slim profile (under 5mm thick), navigating dense foliage. Upon contact, they expand outward, forming a broad, soft cradle that distributes force evenly and prevents bruising.

For varied geometries—like off-center growth or curled leaves—the structure morphs via buckling and reconfiguration, mimicking human fingertips. A final pinching motion, driven by simple pneumatic or servo actuators on the base fingers, ensures secure transport. This step-by-step adaptability was rigorously tested, showing grasp success rates above 95 percent across species. 80

• Collapse phase: Enters narrow inter-plant gaps (2-10mm).
• Expansion phase: Creates 20-30mm contact area for gentle hold.
• Reconfiguration: Adjusts to shapes via compliant deformation.
• Pinch phase: Secures for harvesting and transfer.

Such passive mechanisms reduce energy use and simplify integration into robotic arms, ideal for 24/7 vertical farm operations.

Bench Tests and Real-Farm Trials: Proven Performance

The NTU team validated the gripper through exhaustive bench experiments on common Singaporean leafy crops: lettuce, kale, choy sum, and nai bai. It handled sizes from 50-200g, with stems 5-15mm thick, achieving zero visible damage in over 100 trials. Variations like wet leaves, off-center petioles, and irregular bunching were managed without parameter tweaks.

A pivotal field test at a local vertical farm paired the gripper with a root trimmer for full lettuce harvesting. Success: Clean cuts, intact bouquets, and smooth handoffs to conveyors. Supplementary videos show the gripper in action, underscoring reliability in humid, LED-lit environments typical of Singapore farms. 80

For context, traditional rigid grippers fail 30-50 percent on delicate produce due to point loading, while suction cups struggle with textured or wet leaves. NTU's design outperforms both, paving the way for automation.

Photo by Hanna Lazar on Unsplash

Addressing Singapore's Unique Vertical Farming Challenges

Singapore's vertical farms, like Greenphyto's 23m towers producing 2,000 tons yearly, optimize space but amplify harvesting woes. Dense planting (up to 100 plants/m²) creates micro-gaps hard for rigid tools, and tropical humidity (80-90%) exacerbates slippage. Labor shortages compound this: Agri-workers earn SGD 2,000-3,000 monthly, with farms needing 24/7 shifts.

The morphing gripper cuts labor by 70-80 percent, per similar NTU prototypes, boosting ROI. It aligns with the Agri-Food Cluster Transformation Fund, subsidizing tech adoption for farms targeting the '30 by 30' goals—now adjusted to 20 percent fiber-rich produce by 2035 amid realistic scaling. 129 137

NTU's SGSR: A Hub for Soft Robotics Excellence

This gripper stems from SGSR's mission: Developing adaptive grippers for unstructured environments. Past outputs include grow-and-twine grippers and fiber Bragg grating (FBG) force sensors for precise feedback—recently tested in ICRA 2024. 50 Funded by Singapore's National Research Foundation, SGSR bridges academia-industry, with partners like JTC for farm pilots.

NTU's broader robotics ecosystem, including the Robotic Research Centre, positions it as Asia's soft robotics leader. Professor Phee's team has published 20+ papers on compliant mechanisms, attracting PhD/postdoc talent globally.

Implications for Global Food Security and Agritech

Beyond Singapore, the gripper tackles universal vertical farming pain points. The Asia-Pacific market, valued at $2.7B in 2025, eyes $20.9B by 2035 (CAGR 22.8%), driven by urban density in Japan, Korea, and China. 84 Soft robotics reduces post-harvest loss (20-30% for greens), enhancing sustainability—vertical farms use 95% less water, per SFA data.

Stakeholders praise: Farms gain scalability; policymakers, resilience; consumers, fresher local produce. Challenges remain: Integrating vision AI for plant detection and motion planning for full autonomy.

Future Outlook: From Lab to Farm Lines

NTU envisions end-to-end systems: Gripper + arm + conveyor + trimmer, deployable by 2027. Next: Machine learning for adaptive grasping and multi-crop versatility. SGSR eyes commercialization via NTUitive spin-offs, targeting Sky Greens-like operators.

Singapore's SGD 556M Social Sciences and Humanities Research Fund bolsters such agri-innovations, signaling sustained investment.Career advice for agritech engineers is booming here.

Photo by Victor on Unsplash

Careers in Soft Robotics and Agritech at Singapore Universities

This innovation spotlights demand for robotics experts. NTU seeks faculty in mechatronics (higher-ed faculty jobs), PhDs in soft grippers, and postdocs via CREATE. Salaries: Assistant Prof SGD 120K+, researchers SGD 80K+.

• Skills: CAD, 3D printing, compliant mechanisms, ROS.
• Opportunities: university jobs at NTU, NUS; industry at Sky Greens.
• Tip: Build portfolio with open-source grippers; rate profs on Rate My Professor.

Join Singapore's agritech revolution—check higher-ed jobs and SG university listings.

Why NTU's Work Matters for Higher Education and Innovation

NTU ranks top globally (QS 2026: 12th), excelling in engineering. Such publications showcase student involvement—many authors are PhDs—fostering talent for Singapore's 'Smart Nation'. Aspiring researchers: Pursue academic CV tips.

This morphing gripper not only feeds Singapore but inspires global unis to blend robotics with sustainability. For jobs, visit higher-ed jobs, university jobs, or rate my professor.