I have 3D modelled and am selling (through Shapeways) keychains in stainless steel that carry your own Bitcoin QR code.
Link to the keychain on Shapewayshttps://i.imgur.com/Szv1uWV.png?1 https://i.imgur.com/smcUIAV.png?1The fact that the Bitcoin network is Internet based has the downside that it doesn't work without a piece of technology, such as your computer or mobile phone. So what if, one day, you were away from your computer, your mobile phone just ran out of juice, and you needed to take a Bitcoin payment from someone?
A physically printed QR code that you always carry on you would solve that, of course. But a QR on a piece of paper folded in your (analogue) wallet just doesn't cut it on the nerd coolness scale. A QR code engraved in a
3D printed stainless steel keychain does, however. You always carry your keys with you. Attach your emergency Bitcoin QR code to your keys, and you always have your QR code with you. Of course, as multiple use of one Bitcoin address is discouraged, this is not for everyday use, but for that few times where you can't take a payment in any other way. Sort of an insurance, if you will.
When ordering this QR code keyring, you will be asked to provide a Bitcoin address. I will generate a QR code containing a "bitcoin:" payment request with your address in it and model it into the keychain model that you see in the photos and then let Shapeways print it and send it to you. This way you will get your very own customized and unique Bitcoin keychain.
Note: In order to maximize readability by a QR reader, it is adviced to spray paint the QR side of your keychain in black and then polish off the paint, so as to improve the contrast between the dark grooves (where the paint stays after polish) and the lighter tops. Also, the keychain will often arrive from Shapeways with polishing rubble stuck in the grooves of the QR code. These need to be peeled out with a needle or similar.Link to the keychain on Shapeways