2x Pound coin holder

After the introduction of the new pound coin, my original holder does not work. Handy for car parks or cheap snacks at the shops

Please note:
The original design was done by POP Coin in 1983,
This is work in progress and may not hold coins correctly while i update the design,
This was my first design in Freecad so if anyone can suggest anything please do so.

11/12/2017: After a long while of not having a functioning printer, ( and laziness to fix it) i have come back to this and started printing in PETG as well

It didn't go very well

06/06/2020 : 3 years later upgrading the same printer slowly I believe with Inflation I don't think £2 is enough, moved focus to https://www.thingiverse.com/thing:2705993