First: don't put a full vCard in the QR
There's a QR format that stores the whole contact (name, phone, email, website, address) inside the code itself. It works on paper, but not in 3D: that many characters create a code with a huge number of squares, and on a keychain or stand each one would end up below 1.5 mm, the minimum for a clean print with a 0.4 mm nozzle. The result: a QR that won't scan.
Which link to use instead
A short link to a page with your details. The QR stays simple and, if you change your phone number, you don't need to reprint anything:
- Your website's contact page, ideally with a "save contact" button.
- Your LinkedIn profile, or your Google listing if you're a local business.
- A direct WhatsApp chat:
https://wa.me/followed by your number in international format.
Shape: keychain or stand
- Keychain (50–60 mm): to hand out at trade fairs, to clients or after a meeting. Small, people keep it and see it again. With a short link it scans easily.
- Table stand (70–90 mm): for your counter, reception or booth. Customers scan and take your contact without you handing anything over.
- Wall plate: on your office or workshop door, so people can find you after hours.
Colors and finish
Use your brand colors only if the contrast is strong: a very light base with very dark relief, or the other way round. Put a small logo in the center (the generator leaves room for it) and your name or business name as text. Matte PLA beats shiny.
Before printing 50 keychains, print one and scan it with two or three different phones, including an older one. If any of them hesitates, shorten the link or increase the size.
Frequently asked questions
Can I put my vCard in a 3D-printed QR code?
It's not recommended: a vCard has so many characters that the QR ends up with modules too small to print well. A short link to your contact page works better.
What size should a contact QR keychain be?
50–60 mm with a short link. For a counter stand, 70–90 mm.