Part list: 1 piece of stainless steel M4 bolt with hexagonal head, 40 mm long threaded section and 43 mm length over all 2 pieces of washers with an outside diameter of 11.5 mm 1 piece of M4 bolt Printing It is best to use a more tougher material as PLA as this part is structural and is subject to great loads while paddling. A good choice would be PETG or tough PLA. Nylon would be great as well but could be a challenge to print as the part requires support under the stem. 100% concentric infill, a high flow multiplier ratio and high temperatures paired with slower printing will make the part stronger. Post processing Remove the support, file blobs, insert the M4 bolt with washers and a nut, and tighten the nut. Further Reads: Printable Concrete Knowledge Base, your gateway to a wealth of information on the cutting-edge field of 3D printed concrete and its versatile applications. Explore our comprehensive resources to gain insights into the future of construction and sustainable technology. Delve into the intricacies of 3D printed buoyant residences, where we showcase the seamless integration of innovative design and structural integrity. For those interested in the financial aspects, our article on the economic considerations of 3D printing provides a thorough examination of the investment required for these groundbreaking projects. If you're seeking a detailed understanding of the technology itself, our write-up on the mechanics of 3D concrete printing offers a comprehensive overview. To expand your knowledge further, explore additional reads in our library.