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3D printed QR keychain: how to make a QR code keychain

A QR code keychain is cheap to print and gets a lot of use: it can link to your website, your Instagram, a photo album or your contact details. The challenge is the size: on a small part, every detail counts for the phone to read it.

The key: a short link

The longer the text a QR code stores, the more modules (little squares) it needs. And on a 4–5 cm keychain there isn't room for many.

Use the shortest address possible. “myweb.com” makes a much simpler code than a long address full of parameters.
Trim what you don't need. Many links copied from social media end with tracking text you can delete without breaking them. Check by opening the link.
Think long term. The code is permanent. If the link stops existing, the keychain stops working.

How to make it, step by step

Open the generator and paste your link.
In step 2, choose the “Keychain” format. It already has the key ring hole.
Adjust the size and check the note that shows how big each module is. Ideally 1.5 mm or more.
Add short raised text if you like: a name, a date or the event name.
Scan the on-screen code with your phone and download the 3MF.

Tips so it scans first time

Skip the center logo at small sizes. It covers modules and forces a denser code.
Choose the “Classic” or “Rounded” style. Simple shapes print better when small.
Light base and dark code, in matte filament.
Short text. With a long phrase the letters get too small to print sharp. The tool warns you.

Material and durability

A keychain lives in pockets and bags, among keys and coins. PLA is fine for normal use and is the easiest to print. If it will spend time in a car in the sun, PETG handles heat better. Either way, a relief of just over a millimeter protects the contrast even as the surface wears.

Ideas

Weddings and events: a keychain for every guest linking to the photo album.
Businesses: your website or review page as a gift for customers.
Pets: a link with your contact details for the collar.
Luggage and gear: label backpacks, suitcases or tools.