I noticed after printing the original v2 model in PLA that the cards in the first few slots would not easily extend from the wallet, while the back cards came out too easily. To correct this, I changed the orientation of one corner so that the effective pivot point of the clip is on the back of the wallet. This way the corners stay parallel as the cards extend, preventing an imbalance in tension, allowing all cards to extend with equal resistance.

This modification should not be required when printing in PETG. But if you notice uneven tension across the cards, give this variation a try!