This is an untested model. The dimensions are modeled for the game Carcassonne. The 8 holes are used to hold 3mm magnets in alternating polarity so that multiple tiles will snap to each other and hold together as the game board expands. The actual height is 0.25 " but I do not know of the 0.3" listed will be what is printed by shapeways or if it will be the 0.25" defined in my model. Buy at your own discretion.