Mailbox label generator

What is Mailbox label generator?

This small browser app makes a 3D printable mailbox label: a flat base with a unit number and one or two name lines in raised letters. The default size is 44.5 x 38.5 x 3 mm, made to cover the door decal area of Florence versatile 4C apartment mailboxes; other mailboxes work if you change the size. You type the number and names, click Generate label and turn the result in a 3D preview.

You can upload your own font file or use the included Dosis Bold. Under Advanced you set the width, height, corner radius, side margin, base thickness, raised text height and the point sizes, and choose whether long text shrinks to fit or reports an overflow. An optional QR code is inset into the back of the label (3MF only) and links to the app. Download STL gives one closed solid for a color change at the top of the base; Download 3MF keeps the base, the text and the QR code as separate parts so you can assign black and white in a multi-material slicer. The author calls the 3MF experimental.

The guidance on the page suggests PETG at a 0.1 mm layer height, with a 0.25 mm nozzle for the white lettering. It is free, needs no account and runs fully in your browser, with no server, analytics or font upload. The source code is public on GitHub, but the repository has no license file.

What you can make

• Mailbox labels with a unit number and names
• Apartment and condo door ID labels
• Small two-color name plates

How to use Mailbox label generator

1. Pick a font: upload your own or choose Included fonts
2. Type the unit number and one or two names
3. Click Generate label and check the 3D preview
4. Download the STL for a color change, or the 3MF for two filaments