Hi Non-Twisty Puzzles fans, FourKnot is a five-piece assembly puzzle. The object is to put the pieces together, such that they form a continuous loop. The solution is a knot shape that has four crossings, according to knot theory. This makes it the second simplest knot. The knot pieces loop like rope with five stands. The piece are held together by ten 5x5x5-mm magnets. The puzzle is quite confusing. Other than making the knot, one can fold various rope shapes. Watch the YouTube video. Watch the 3D-printer in action. Download the CAD file to print-it-yourself. Buy the puzzle at my Shapeways Shop. Read more at the Non-Twisty Puzzles Forum. Check out the photos below. Enjoy! Oskar