Description:
This is a 3D printed multifunctional pen that works as a comfortable everyday pen, but it also has a hidden bonus feature!
Inside the pen, you can store up to 10 small plates (3 mm x 80 mm) — perfect for discreetly holding information or formulas.

Each plate can hold around 30

 characters, giving you a surprisingly large storage capacity for text.
The letters are so small that they become unreadable from about 50 cm away, making it ideal for creative or educational uses.

⚠️ Important:
To use this hidden feature, you’ll need to generate and print your own 3×80 mm info plates.
You can design them yourself or even use an AI model to generate the text and export it for printing.

Printing tips:

• You can print the plates with a 0.4 mm nozzle, but make sure to place them on the thin side, as shown in one of the reference images.
• In your slicer, set the line width to 0.3 mm when printing the plates — this ensures the letters are clearly visible even with a 0.4 mm nozzle.
• For best results, use a 0.2 mm nozzle and print the plates flat on the bed — this improves legibility, though the text becomes more visible from a distance.

Whether you just want a nice pen or a clever tool with a secret twist — this model combines both practicality and creativity!