The Barrel and Ball Puzzle (Hoffmann)

by ThePuzzleGeek, published

The Barrel and Ball Puzzle (Hoffmann) by ThePuzzleGeek Oct 3, 2012

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Inspired by the "Barrel and Ball Puzzle" first described in
Professor Hoffmann's "Puzzles Old and New" published by F. Warne (1893).

Pop a marble in the barrel, close it up and pass to a victim to remove.


Print AllParts.stl and add a marble.

This thing uses Karl Maximilian's screw thread library (Thingiverse 31363) place the screwthread script in the same directory.

If the screw thread is too tight/loose adjust the tolerance in the OpenScad script and just generate/print the BarrelEnd part. The thread should be tight enough to prevent the base of the barrel being turned just using finger pressure.

The marble should have a diameter of 15 or 16mm.

The barrel does use quite a bit of material in the upper half to enable the top to be printed - any suggestions on how I could minimise this greatfuly received as I'm new to OpenScad/3D design!

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Any chance that you have a copy of this barrel with a top that comes off and has no hole in it?

I also can't understand how this thing works! I printed it assembled it and I can't get the marble out of the thing. I am stumped.

UechiMike scad file now posted - an initial oversight on my part.

Stienman- thanks for posting the link to the book. For those that like solutions, an explanation is given on page 48. This puzzle is a little trickier than the original, due to the scale and smoothness of ABS. A couple of minor design features mean that it is eminently solvable.


Can you post the scad files for this?

The book mentioned is out of copyright in the US, and can be found here: http://archive.org/details/puzzlesoldnew00hoffhttp://archive.org/details/puz...

This puzzle can be found on page 20: http://archive.org/stream/puzzlesoldnew00hoff#page/20/mode/2uphttp://archive.org/stream/puzz...

Note that it may still be under copyright elsewhere.