Laser Etching of Variable QR Codes

Want to start from scratch and create a dynamic QR code that can be laser-etched in real time? We'll show you how to use simple tools to create a dynamic QR code and laser-etch it in one fell swoop.No programming skills are required, and users can easily create personalized designs by mastering the key steps. The system can be applied to industrial labeling, creative gifts and other areas.

Why is a variable two-dimensional laser code necessary?

Nowadays, many industries can't do without QR codes, for example, to trace the origins of products, for signing in at events, or even for personalized gifts.However, traditional static QR codes are restricted to a fixed content, and lack flexibility.The variable QR code can generate new content according to different needs, and the laser engraving can be quickly done. The efficiency has been doubled, and it is not easy to make mistakes.This is especially useful for small-scale customized production or frequent product changes.

Tools needed: 1.

Software selection.

I recommend using a free online tool like QRCode Monkey to generate the QR codes. This tool can directly output vector graphics (e.g.If you want to automate the process, you can try the qrcode library in Python, which lets you generate batches of QR codes in just a few lines of code.

Hardware facilities.

A laser engraver that supports vector files is a must.Beginners are advised to select a CO2 laser machine, which is simple to use and inexpensive.Remember to test the speed and power of the carving beforehand. The parameters need to be adjusted for different materials (wood, acrylic, metal).

Three steps to real-time carving.

A dynamic QR code is generated.

Open the QR Code Monkey website and input the text or link you want to turn into a QR code.The key point: Select the "dynamic code" option. This way, the structure of each QR code you generate will be the same, with only the content changing.SVG format is recommended for saving, as it guarantees clear edges.

Laser engraving software.

Import the SVG file into LaserGRBL or LightBurn.When setting the engraving path, remember to change the line style to "fill" so that the black and white regions of the QR code can be fully engraved.When testing a piece, he will first use scrap material to avoid wasting the real thing.

Adjust your technique as you go.

If the carving is not clear, it is usually because the speed is too high or the power too low.For acrylic, the power should be set at 60 % and the speed at 200mm / min. With wood, the power can be increased to 80 %.If you pause in the middle of a job to make some changes, you can simply update the QR code in the generation tool, re-import it, and continue carving without restarting the machine.

A Guide to Avoiding Pitfalls: Common Problems of Beginners.

Failed to scan QR code.

Before you blame the machine, first check two things: 1) Is there enough blank space around the code (at least 4 modules wide)? 2) Is the depth of the engraving uniform?For testing, you can use a mobile phone to take pictures from multiple angles.

Small tricks to improve efficiency.

When generating batches of QR codes, he uses an Excel spreadsheet to organize the content, then uses a Python script to automatically generate and name the files.With this system, 100 codes can be processed in the time it takes to drink a cup of coffee.

And finally, a reminder: when using the laser cutter, be sure to wear eye protection and make sure the room is well ventilated.At first, you may get a bit flustered, but with a few practice runs you'll have no trouble customizing your own high-tech products.