Here's a Marble Solitaire game, with reversable lid / base which screws securely onto the board. For storage, the balls are retained in their depressions by the lid. I've included 2 ball designs, a solid one and an "open" one, because I don't want marbles around my small children. Having printed both, I think the "open" design is by far my favourite. It prints nicely looks cool and is easier to pick up. I've made the design 215mm diameter and to suit 14mm marbles (9/16"). This should make it printable on most machines. A complete game set is 1 board, 1 lid & 45 balls.