Pentacubes consist of 5 connected cubes. There are 29 pentacubes. This gives a total of 145 cubes. In the box fit 5x5x6 = 150 cubes. There are 5 cubes missing to fill the box with pentacubes. If you print the pentacube_I twice and use the solution shown in the figure, the box is completely filled.
I printed the puzzle with the following settings:
Material: PLA
Resolution: 0.2mm
Infill: 20%
Support is required for Pentacube_2 and Pentacube_3 only
no raft, no brim
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The author marked this model as their own original creation.