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The tolerances on the pieces are very tight as they do tend to loosen up over time. Tolerances are printer dependent, so even though they work well for me, they may not for someone else. Here are two solutions though.

  1. Scale the pegs and pieces down uniformly by a very small amount in your slicer. I would guess that 1-2% would be plenty.

  2. Roll up a piece of sand paper and smooth down the holes on the board.

Let me know if this works.