Holder is sized for all 5 NZ coins to snap into. The narrow slots give a bit of spring to the dimples on the inside of the holes so that the coins are held firmly. There is a thin shoulder on the back to stop the coins popping right thru.
I use it to carry some coins in the same pocket as my phone without scratching the screen. Also for carrying some coins in the car ashtray without rattling. It might make a nice gift for overseas visitors as a display set.
Print it and use it.
Printed in PLA with 0.2mm layer height and 0.6 honeycomb fill pattern. The design will probably tolerate wide variation from these settings.
The design relies on a well calibrated printer that gives good accurate internal dimensions.