Thumb card wallet

This card wallet, which can hold 6 cards, can be opened with just one hand, by pressing a slider down with your thumb. The mechanism is unlikely to get inadvertently activated when it is in a pocket or bag.Cards don't fall out thanks to an adjustable friction spring.The front and rear can be decorated in Bambu Studio with texts, shapes and images in multi color or embossed. For my own wallet, I embedded a QR code on the rear so if the wallet gets lost whoever finds my wallet will find directions on how to return my wallet (and to get a similar personalized wallet as a reward).I only used 6 M3 allan/hex/imbus bolts of 8mm, and one 10mm for the adjustable friction spring. (In fact, I used 10mm bolts everywhere as I bought a bag of 1000 of these on some Ali-site, but trimmed them down to 8mm to bolt the shells together). The heads of the bolts will sink into the top panel but some 1mm will remain sticking out which is no problem thanks to their rounded heads. I do not use thread inser