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Fun little puzzle that, when assembled, the parts do not align.
The part is a 2mm hollow shell, with a 6mm hole to remove the inner material, allowing the price to be cut in half. Furthermore there is a 0.5 mm allowance between any two parts , which should be sufficient for most materials and finishing ( I haven't tested them all),
Please note that a complete set requires 6 pieces, hence purchase quantity must be 6.