This laser-cut three-part locking clip assembly has excellent tensile strength and good rigidity. It is designed for semi-permanent parts installation, and can be incorporated in complex 3D parts which need strong 90-degree connections. This joint, with minimal modification, can be used with any reasonably rigid material, ranging from sheet plywood or even hardwood, acrylic, and even softer materials like thicker felt and cork.
This is an open-source design. We’d love it if you’d incorporate it into your own projects - please let us know if you do!