A nice little project & good idea for card storage. Two points to note : (1) the overhang near the end (slot for the SD adapter) gave me unbound threads. Maybe one can add supports or change speed. Though after clipping these away, it works just fine. (2) pay attention to how you insert your TF cards! Metal interface should go down. Otherwise it gets stuck & is a pain to remove (my mistake) Overall, I'm very satisfied with the idea, design & the final effect. Thanks!