Bill of materials for 3D printed components.

Although there has been considerable progress in distributed manufacturing of open-source designs for mobility aids, there is a notable lack of affordable, open-source crutches. Crutches are a vital tool for many individuals with mobility impairments, yet the high costs limit accessibility. Even more, they are in short supply in regions undergoing conflict. The goal of this study is to address this need by leveraging the principles of free and open-source hardware and the capabilities of digital distributed manufacturing to create a low-cost, functional crutch that can be easily produced and customized locally using inexpensive desktop 3D printers. All the design files are open-source, and the design process incorporated load-bearing tests using a hydraulic actuator under static loading conditions to meet the ISO 11334-1:2007 standard for walking aids. The open-source forearm crutch developed in this study not only surpasses the requirements of the ISO method for load capacity (1,516.3 ± 169.9 N, which is 51.6% percent above needs), weighs a fraction of comparable commercial systems (0.612 kg or 27% of proprietary devices), and is customizable, but also offers a highly cost-effective solution; costing CAD $36 in material, which is less than all equivalent crutches on the open market. If recycled plastic is used, the material cost of the crutch could be further reduced to under CAD $13, making it much more accessible.尽管移动辅助设备开源设计的分布式制造已取得长足进展，但当前仍显著缺乏价格亲民的开源拐杖。拐杖对众多行动障碍人士而言是至关重要的辅助工具，然而高昂的成本限制了其可及性；在冲突频发地区，拐杖更是供不应求。本研究旨在解决上述需求：依托自由开源硬件（Free and Open-Source Hardware）理念与数字分布式制造能力，打造一款低成本、实用性强的拐杖，可通过低成本桌面3D打印机在本地轻松完成生产与定制。所有设计文件均开源，且设计过程中采用液压作动器在静态加载条件下开展承重测试，以符合行走辅助设备的ISO 11334-1:2007标准。本研究开发的开源前臂拐杖（forearm crutch）不仅在承重能力上远超ISO标准要求（1516.3±169.9牛，较标准需求高出51.6%），其重量仅为同类商用产品的一小部分（0.612千克，仅为专有设备的27%），且支持定制化，同时具备极高的性价比：材料成本仅需36加元（CAD $36），低于公开市场上所有同等规格的拐杖。若使用回收塑料作为原料，拐杖的材料成本可进一步降至13加元（CAD $13）以下，大幅提升其可及性。