Almost always one of three things:
- The modules are too small. The little squares bleed into each other as the laser cuts, and the scanner can no longer resolve the grid. This is by far the most common cause. Watch the module size readout — under about 0.4 mm per module, most materials are a problem.
- The quiet zone is missing. A QR code needs clear space around it. Placing it hard against a border, a logo, or the edge of the part breaks it. Every export from this tool already includes a four-module quiet zone — do not crop it off.
- The contrast is too low. Dark engraving on dark material does not read. You need a clear light/dark difference between the modules and the surface behind them.
Always test-scan the finished piece with a real phone before running a batch. A code that reads perfectly on screen can still fail on wood.
Aug 28, 2026