Magnetic Dart

thingiverse

This is a magnetic dart that uses a normal whiteboard as its target. To create it, you'll need to print the paper tail on a standard printer, cut it into a square shape, fold it in half, and insert it into the dart body - feel free to design your own unique tail. To get started, obtain a round magnet that's 10mm thick and 5mm high; you can find these online at retailers like supermagnets.ch. Next, cut out a 2cm disc with a 1cm hole in its center, which will serve as a shock absorber; I used a 3mm isolation foam for this purpose. For the tail-fin, refer to the included .pdf file for an example design. Print it borderless on A4 paper (American formats should work just fine) and cut it into a square shape. Fold the ends of the paper along the horizontal line upwards in a valley fold, then turn 90 degrees and fold the ends back up along the vertical line in another valley fold. Flip the paper over and fold it according to the dotted diagonal lines in a mountain fold; repeat this process for the other diagonal. Finally, form the fin by holding the end together with four fingers, ensuring that the tip is sharp. Insert the tip into the body, which has tapered cuts inside to accommodate the 90-degree angle of the tip. If you're using 80-100g paper, glue may not be necessary - at least, it wasn't for my Da Vinci Mini W 3D printer.