In this video, we do box joint jig easily. I not have guessed that interlocking pieces of wood could be so durable. Wood joints with box joint are very solid. The few attempts I've made have surprised me. It was extremely solid.
You can easily make this DIY box joint using some plywood. You can start doing it after downloading the PDF plan from the link below and watching the video.
Making Video :
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PDF Download : BOX JOINT Making PDF
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