I had a thought about how to create a marble maze that is placed onto a peg board, using a few simple pieces that can be shifted around to change the maze layout.

As usual, this is a parametric design in OpenSCAD, so a few parameters can be changed depending on desires.

Note: This is an untested concept design. YMMV.

1. Make a board composed of a grid of 6mm holes separated by 27mm
2. Place lots of the base models on top of this grid, so that they fit into the holes
3. Place a flat or hole model on top of each base
4. Place a wall or spacer model between each flat/hole piece as desired to create a maze