3D QR code generator: QR code plates and keychains to 3D print

Size comes from the module

A QR code is a grid of square modules. Studio picks the smallest QR version that holds your content at the error correction you choose, then multiplies by the module size. The plate is the code plus a quiet zone on every side:

Plate width = (modules + 2 x quiet zone) x module size

Sizes from the generator at 1.5 mm modules, a 2 module quiet zone and error correction M:

Higher error correction adds modules: the same depthue.com link is 29 x 29 at H. A shorter link makes a smaller code, which matters most on a keychain.

Raised, engraved or flush

• Raised modules stand 0.4 to 3 mm on the plate. Print the plate light, change filament once at the top of the plate, and the code prints dark. With the defaults the change is at 2 mm.
• Engraved modules are cut in. The depth is capped so 0.6 mm of plate stays under the code. Fill the pockets with paint, or engrave a light code into a dark plate.
• Flush modules sit in pockets as their own pieces, level with the top. The default code becomes 20 shells: the plate plus 19 module pieces, 0.02 mm clear in 1.22 mm pockets. Load the file in a multi material slicer, split it into parts, and give the module pieces the second filament.

Modules that touch only at a corner get a tiny bridge, so the code is a valid closed solid that passes the edge check instead of a mesh your slicer has to repair.

A part, not just a file

The free QR code to STL tool is the fastest way to one QR plate, with no account. Use the Studio part when the code goes on something:

• A sign with a code. Add a sign and a QR plate, set the plate thin, place it on the sign and join the two with a boolean.
• A box with a code on the lid. Put a link to a manual or a reorder page on a box with lid.
• A QR code keychain. Set a keychain hole and the plate gets a tab above the code. For a name on a tag instead, use the keychain generator.

The plate keeps its settings in the project, so you can change the link later and it rebuilds. A boolean keeps each object where you placed it.

Make it scan

Keep the quiet zone at 2 modules or more, print dark on light, and avoid silk or translucent filament, which lowers the contrast. Test the scan on the slicer preview or the first print before you run a batch. For a laser instead of a printer, the QR code generator for laser engraving gives vector SVG and DXF files.