HAS TO BE PRINTED IN BRIGHT RED!!

Rocketbook has an app that lets you take photos of their reusable notebooks (which are awesome, by the way) and turns them into clean, scanned-like images. They're big on open-source, too --you can print your own pages to write on. The app neatly removes background colors, transforming them into a crisp white, often outperforming your average scanner app.

One of the apps standout features is the ability to take photos of whiteboards or similar boards. To do this, you need four bright red triangles to mark the corners of your board, helping the app know where to crop the image.

Since I use a magnetic whiteboard, I created a 3D-printed solution where I can press magnets into the triangles, allowing me to move them freely on the board.

Important details:

• Magnet size: 12mm diameter, 3mm height
• Filament color: BRIGHT RED (This is crucial for the app to recognize the corners correctly)

If your lighting is angled, you might see black shadows in the corners, which the app can't always remove. This hasn't bothered me personally, but printing the triangles a little thinner might help a bit (although I haven't tested this yet).

As you can see, I've added an NFC sticker to one of the triangles, programmed to launch the Rocketbook app on my phone. The app never had any issues with the small white dot in the middle of the triangle.

Oh, and most importantly: visit rocketbook.com or your local office supply store to buy a Rocketbook, so the company can continue developing this awesome app!