Hoffman packing puzzle

Hoffman’s packing puzzle, introduced by Dean G. Hoffman in 1978, is a type of assembly puzzle. It consists of 27 identical rectangular blocks, each with three unequal edge lengths. The challenge is to arrange all of them so they fit perfectly into a cube whose side length equals the sum of those three dimensions. According to Hoffman, typical solving times range anywhere from about 20 minutes to several hours. dimension: model dimensions: 40x50x60 (blocks); 150x150x150 (box) print profile scaled to 0.3 the puzzle can be used as teaching aid for AM > GM