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Make a printable QR code for a link, a menu, a wedding album or a business card: as a keyring with a hanging hole, a tag with a keyhole to hang on a screw, or a small sign with an optional label. Set the size, the base thickness and how far the code stands proud.
Scan the preview with your phone before you print. The page warns you if the squares are too small for your nozzle, and the link is never sent anywhere: the code is generated in your browser.
Yes, when there is enough contrast. A scanner reads light and dark, not height, so change filament at the top of the base plate: a light base with dark squares. The page shows the exact height.
Big enough for each square to be at least about two extrusion widths. Longer links make denser codes, so a shorter link lets the same tag have bigger squares.
No. The clear border is part of the QR standard and scanners need it; it is already included in the size.
Yes. A short bold label prints best; it is kept a full border away from the code so it does not stop it scanning.