A customisable coin holder.
Update 15th April 2019: Added CA coins
Update 16th April 2019: Added Japanese Yen coins. Rendered a CA version without the 50 cent coin, as I've heard it's not commonly used.
This design is initially configured to hold a full set of UK coins from 1p to £2. You can also print versions for US, EU, Canadian or Japanese coins, simply by specifying the currency. Or you can change the set of coins to suit your own needs.
The design cleverly calculates the correct overall diameter for the coin holder, based on the coins that it's configured to hold. Much of the calculation must be credited to my daughter, Alice who, by applying her A-Level maths skills, gave me a solution that was evading me.
Note: I got the dimensions for the coins from Wikipedia. I've only tested the UK and Japan versions and they came out fine. If you find any that are sized incorrectly, please let me know so that I can fix any errors in a future version.