[{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/puzzle-types/burr/","section":"Puzzle_types","summary":"","title":"Burr","type":"puzzle_types"},{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/designers/","section":"Designers","summary":"","title":"Designers","type":"designers"},{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/tags/example/","section":"Tags","summary":"","title":"Example","type":"tags"},{"content":" Designer UnknownMakerNot built yet: OpenSCAD renders Type BurrPieces6Level1 This is a worked example of a puzzle post on Next Piece. It will be replaced by real posts soon. The puzzle is a real one, though: Burr No. 305 from Bill Cutler\u0026rsquo;s tabulation of the 314 solid notchable six-piece burrs.\nA six-piece burr is three pairs of notched 2×2×6 sticks crossing at right angles. Solid means the six sticks fill the burr shape completely: 104 cubes and not one gap. With no room to wiggle, the very first move has to take the puzzle apart, which makes it a level-1 burr. The sticks are named by their Känel numbers, a compact code for a stick\u0026rsquo;s notches: 52, 615, 792, 960, 975, 992. They fit together in exactly one way.\nThe pieces # Assembled The six sticks laid flat. Red 52, blue 615, yellow 792, green 960, orange 975, purple 992. Turn it around # The pieces pulled apart from the centre so you can see how the notches meet.\nBurr No. 305, exploded view. Drag to rotate · scroll or pinch to zoom Taking it apart # Every separation below is a single straight slide, checked by a search over all the ways each group of sticks can move.\n1 Step 1: Red, green and purple (52, 960 and 992) slide out together along the red stick. 2 Step 2: One move later the burr is in two halves of three sticks. 3 Step 3: Each half gives up one stick: red slides sideways out of its half, yellow lifts out of the other. 4 Step 4: The last two pairs come apart: green from purple, blue from orange. How the images were made # The sticks were generated from the six Känel numbers, checked to have exactly one assembly, rendered in OpenSCAD and converted to a coloured GLB for the viewer with the blog\u0026rsquo;s tools/stl2glb.py. The colours are PLA filaments in stock, so a printed copy can match.\n","date":"9 November 2026","externalUrl":null,"permalink":"/posts/example-burr-305/","section":"Posts","summary":"A classic solid six-piece burr, used to show what a puzzle post here looks like: facts box, gallery, disassembly steps and a 3D model you can turn around.","title":"Example post: Burr No. 305","type":"posts"},{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/","section":"Next Piece","summary":"","title":"Next Piece","type":"page"},{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/posts/","section":"Posts","summary":"","title":"Posts","type":"posts"},{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/puzzle-types/","section":"Puzzle_types","summary":"","title":"Puzzle_types","type":"puzzle_types"},{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/tags/six-piece-burr/","section":"Tags","summary":"","title":"Six-Piece Burr","type":"tags"},{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/tags/solid-burr/","section":"Tags","summary":"","title":"Solid Burr","type":"tags"},{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/tags/","section":"Tags","summary":"","title":"Tags","type":"tags"},{"content":"","date":"9 November 2026","externalUrl":null,"permalink":"/designers/unknown/","section":"Designers","summary":"","title":"Unknown","type":"designers"},{"content":"","externalUrl":null,"permalink":"/series/","section":"Series","summary":"","title":"Series","type":"series"}]