Magnetic Dart

myminifactory

This is a magnetic dart. Any normal whiteboard with any drawing on it can be used as a target. This design is a next-generation version of the previous dart with a spring that was not durable enough and would not survive several throws. In this design, the spring has been replaced by a ring made out of some isolating foam to make it more resilient. You need to print the paper tail on a normal paper-printer, cut it into a square shape, fold it in half, and insert it into the dart body. You can create any tail you like. Further, you will need a round magnet that is 10 mm in diameter and 5 mm high. These magnets are available for purchase online at websites such as supermagnets.ch. Additionally, cut a 2 cm disc with a 1 cm hole to glue around the magnet for shock absorption. I used a 3 mm isolation foam. For the tail-fin: there is a .pdf file provided as an example. Print out this file borderless on A4 format, preferably. After printing, cut the paper into a square shape. Fold the ends along the horizontal line up (valley fold) and then fold back, turning 90 degrees and folding the ends according to the vertical line up (valley fold). Turn the paper over and fold the paper according to the dotted diagonal lines (mountain fold). Repeat this process for the other diagonal. Then form the fin as shown in the picture by holding the end together with four fingers. Make sure that the tip is "sharp". Insert the tip into the body, where the cuts inside are tapered to accommodate the 90-degree angle of the tip. When using 80-100g paper, glue is not needed (at least for the result on my 3D-printer, Da Vinci Mini W). I have added some pictures to explain this process.