This is a solid model of my "Arrow 3D" logic maze:
The aim is to get to the sphere starting from the arrow in the diagonally opposite corner.
The rule is that from each arrow you can move to any of the arrows it's pointing to, in the same row, column, or diagonal. Continue in this way until you find a route to the goal.
The model in the photo was made in alumide.
5.076 w x
5.144 d x
1.998 w x
2.025 d x