The Barrel and Ball Puzzle (Hoffmann)

thingiverse

In the "Barrel and Ball Puzzle," Professor Hoffmann's 1893 publication, F. Warne introduced a challenging game. To play, insert a marble into the barrel, close it, then pass it on for others to remove. To create this puzzle, print AllParts.stl while adding a marble. The screw thread library by Karl Maximilian (Thingiverse 31363) is required; place the "screwthread" script in the same folder. Adjust the OpenScad script's tolerance to alter the screw thread tightness or looseness, focusing on BarrelEnd part generation. The base of the barrel should not be rotated by finger pressure alone. The marble diameter must be 15 or 16mm. The upper half of the barrel consumes a significant amount of material for printing; suggestions to reduce this are welcomed as it's my first OpenScad/3D design project!