CAUTION: THIS IS ONLY THE SPHERE CORE!! This a spherical core for Mefferts'
Mosaic Cube, designed by me. Several people have noticed that the mechanism is a bit "
spongy". The issues are illustrated by Roxanne Wong in this
YouTube video.
The cause of this spongyness, and the resulting less-than-optimal turning, is the large cavity inside the puzzle into which the pieces are pushed. Twisty Puzzle Forum contributor Burgo suggested to
fill the cavity with a spherical core. This new spherical core fills the cavity completely, making the puzzle more stable.
Watch the
YouTube video.
Read at the
Shapeways Forum.
Read more at the
Twisty Puzzles Forum.
Note that this model is only the new spherical core. You can buy the Mosaic Cube online from
Mefferts.