Balanced Soma is a Soma-Cube puzzle that was first published in the book "Puzzles of the World" (Botermans & van Delft) in 1978. The object of the puzzle is to balance all soma pieces on the middle bottom of the puzzle. Patrick Luteijn likes that puzzle and commissioned a spherical version. Both the cubic and spherical versions work well. The wooden variants are slightly more stable than the PLA plastic versions, as the plastic is more slippery than the wood.
The set of pieces took 8¾ hours to 3D print on a Dutchy 3D printer. 36 meter of 1.75-mm wood-filled PLA filament was used to print it. The puzzle weights 107 gram.