This unfortunately wouldn’t work for Australian coins. Our 5cent coins are too close to the diameter of our $2 coins, and the 10cent coins too close too the $1.
Potentially the problem could be overcome allowing the 5c and $2 coins into one hole (and likewise the 10cents and $1 into another) , then having an extra track that flips the coin onto its side and allows them to dropthrough based on their widths; but I imagine jamming would be frequent.
