Multifunctional Hidden-Note Pen

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