It's simple to print. No supports required. The print time is around 2 hours for both parts with 0.2mm layer. No need to set it lower for any extra detail as there isn't any. There are no shapes where a thicker layer would be visible.
You do need 2 screws with nuts or 2 rivets to hold the clip securely. I like the look of the screws. It adds some rigidity to the wallet and the clip can be easily replaced. I had some from previous project so I used those. The screws are 10 mm long with 4 mm diameter. The nut has 7 mm and it fit nicely to the wallet body so it's hidden and no tool is needed to hold it in place during assembly. As I needed 2 wallets and had only 2 screws then I used aluminium rivets and it worked nicely as well.
For best print set the perimeter layers (vertical shells) to min 3 and shell thickness (vertical shell to 1 mm top and 1 mm bottom. This way there will be no hollow space inside. This can be configured maybe easier, but I'm a noob.
V1 issues:
V2:
V3:
The author hasn't provided the model origin yet.