🔪 Mini Box Cutter / Utility Knife

A compact, lightweight mini utility knife designed for everyday carry, hobby work, opening packages, and precision cutting. Its small size makes it perfect for your keychain, pocket, backpack, or toolbox while still using standard utility knife blades.

The knife features a simple retractable blade mechanism operated with a thumb slider. An internal rubber band automatically retracts the blade when the slider is released, providing an extra layer of safety.

✨ Features

✅ Compact size: 80 mm × 30 mm
✅ Uses standard utility knife blades
✅ Automatic blade retraction with a rubber band
✅ Lightweight 3D printable design
✅ Comfortable thumb-operated slider
✅ Pocket & keychain friendly 🔑
✅ Easy assembly with minimal hardware

🧰 Hardware Required

🔹 1 × Standard utility knife blade
🔹 2 × Small screws
🔹 1 × Small rubber band (for auto-retraction)

🔧 Assembly

1️⃣ Place the rubber band into the rear groove of the body.
2️⃣ Install the thumb slider and hook it onto the rubber band.
3️⃣ Position the utility blade onto the locating posts.
4️⃣ Install the blade retaining plate.
5️⃣ Insert and tighten the two screws (do not overtighten).
6️⃣ Test the slider to ensure the blade retracts smoothly.

🖨️ Print Settings

📏 Layer Height: 0.20 mm
🧱 Walls: 3-4
🟦 Infill: 20-30%
🧵 Material: PLA / PETG / ABS
🚫 Supports: Not Required
📐 Orientation: Print flat on its largest face

🛡️ Safety

⚠️ This model uses a real utility knife blade.

🔸 Handle with care.
🔸 Keep the blade retracted when not in use.
🔸 Keep out of reach of children.
🔸 Wear eye protection during assembly if needed.
🔸 Assemble and use responsibly.

🎯 Perfect For

📦 Opening packages
📄 Cutting paper & cardboard
🎨 Crafts & hobby projects
🏕️ Camping & outdoor use
🧰 Workshop tasks
🎒 Everyday Carry (EDC)

❤️ Support the Project

If you enjoyed this model:

⭐ Leave a rating
👍 Like the model
📸 Share your print
💬 Leave your feedback