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      "content": "Return a list of useful references (only with links), as Markdown, grouped : Articles, Books, Papers, Youtube, Opensource Designs, ... Dont comment !\n\nText to process:\nCreate a climbing brush utilizing plastic dough and woodworking techniques to craft a distinctive pattern.\n\nNo shredder or additional equipment is required, only an oven. However, using power tools such as a sander, saw, or router will simplify the process.\n\nFor any potential improvements, kindly leave comments or contact us through social media.\n\n\nUser Location: Hong Kong, Hong Kong\n\n## Required Tools for the Project\n\n- Oven\n- Oven tray\n- Teflon Paper x2\n- Heat-resistant gloves\n- Mould, at least 11.8 inches (30 cm) in width, 98.4 inches (250 cm) in length, and 7.9 inches (20 cm) in height\n- HDPE plastic\n- White glue\n- Saw (such as jaw saw or band saw)\n- Sander (with grits 40, 80, 120, 240, 400, 800, 1000)\n- Polisher with a wool pad\n- Soldering iron\n- Woodworking CNC router\n\nFor this project, HDPE plastic is required, as tests with PP revealed difficulty in kneading. Ensure the plastics are clean and free of labels. Cut them into pieces and sort by color.\n\nThe quantity of plastic necessary depends on the mold's size. For every 1 cm³ (0.061 in³) of volume, one gram (0.035 oz) of plastic is needed. In this case, approximately 850 grams (30 oz) of HDPE is required.\n\nLayer the plastic sheet on the oven tray with a Teflon sheet between each layer. If the plastic pieces do not stack neatly, place them in a separate container with a Teflon sheet. \n\nPreheat the oven to 180-190 degrees Celsius (356-374 degrees Fahrenheit) and heat the plastic for approximately 25-30 minutes, or until melted.\n\nUsing a pair of thick gloves, remove the plastic. Stack the pieces, cut, and fold them. Explore and develop a method to layer multiple colors in the plastic material effectively.\n\nAfter a few minutes, the 'dough' should cool down and become too firm to knead. Place it back in the oven, melt it again, and repeat until the desired pattern is achieved.\n\nWhen you are satisfied with the dough, place it into the mold and press with a heavy object. Allow it to cool.\n\nFor larger molds, cut a strip approximately 1.18 inches x 9.84 inches x 0.98 inches (30mm x 250mm x 25mm) using a saw. A wood-cutting blade is suitable for this task.\n\nPrint the outline of the brush to the correct scale and attach it to the strip using white glue. If the surface is not level and difficult to adhere to, sand it with an abrasive tool. Then cut out the outline, leaving an offset of 1/16\" to 1/8\" for additional sanding.\n\nSand the plastic into the desired shape using sandpaper with grits of 40, 80, or 120. Both a belt sander and a hand sander can be utilized effectively.\n\nIf there are any holes in the brush, fill them with leftover materials using a soldering iron. Trim the excess plastic with a cutter and sand it again.\n\nWhen the shape of the brush is formed, continue sanding until reaching 1000 grits. (The term \"grits\" remains the same, as it is a measurement scale for sandpaper.) Then, polish the brush with a wool pad at high speed. If any scratches appear, sand it again.\n\nWhile waxing during polishing is optional, it is not required.\n\nApply adhesive to the area to be milled on the brush and proceed with milling using a CNC Router. Retain 0.04 to 0.08 inches (1-2 mm) of the brush edge. The hole should have a minimum depth of 0.39 to 0.59 inches (10-15 mm) to ensure the stability of the brush bristles.\n\nAlternatively, drilling holes is also an option, though it will significantly increase the time required to insert the bristles.\n\nDrill a hole for an M3-M5 screw at the end of the brush to attach a rope.\n\nImportant: Use masking tape to protect the brushes.\n\nTo insert the hair, use epoxy. Fill the area with 3-5 mm (0.12-0.2 inches) of epoxy and place the hair until the space is filled.\n\nAllow the epoxy to set.\n\nMaintain approximately 0.79 inches (20 mm) for the tip of the brush, and 0.59 inches (15 mm) for another direction, as the tip wears down more rapidly.\n\nThere is no reason to make a climbing brush unless you intend to climb. Visit your climbing gym or the crag and start using your new brush to clean the holds."
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