Conventional honey harvesting practices are labour-intensive, disruptive to bee colonies, and often require manual frame handling, uncapping or mechanical extraction, which can adversely affect colony health, honey quality, and beekeeper safety. To overcome these challenges, this study presents a passively actuated self-flowing beehive system that enables fully automated honey extraction without the use of external power, electronics or direct human intervention. The pro-posed system is based on a 3D-printed, biodegradable bioplastic structure and incorporates a novel dual-frame mechanism comprising an upper frame and a lower (down) frame housed within a protective casing. The upper frame is constrained by fixed pins that define its vertical motion limits, while the lower frame is mechanically coupled to the upper frame through sliding pins that enable guided vertical movement. A set of compression springs anchored at the base of the housing provides a gravity-driven, weight-responsive actuation mechanism. As honey accumulates within the comb, the increasing load compresses the springs, resulting in controlled relative displacement between the frames. Once a threshold honey weight is reached, internal openings align with dedicated outlet channels, allowing honey to flow naturally by gravity into interconnected collector plates. Following extraction, the reduction in load allows the springs to expand, returning the frames to their original configuration and preparing the system for subsequent harvesting cycles. This self-resetting mechanism ensures repeatable, maintenance-free operation. The system significantly reduces disturbance to bees by eliminating the need to open the hive or remove frames during harvesting, thereby supporting improved colony health and productivity. By integrating passive automation, sustainable materials, and additive manufacturing, the proposed beehive system offers a low-cost, eco-friendly, and scalable solution suitable for rural, off-grid and commercial apiculture ap-plications, representing a significant advancement toward sustainable and low-intervention honey harvesting.

Passively Actuated Beehive System, Automated Honey Harvesting, Gravity-driven Extraction Mechanism, 3D-printed Bioplastic Beehive