Modular 2-in-1 Utility Knife with TPU Handle & Blade Storage
Introducing a new utility knife model designed with a focus on functionality, safety, and customization. The main feature of this project is its modular system. You get two fully functional tools in one: an ultra-compact everyday carry (EDC) box cutter and a comfortable, full-sized utility knife for heavy-duty tasks.

🌟 Key Features:
Two Modes of Use: The inner module is a standalone, slim, and lightweight knife perfect for opening packages or carrying on a lanyard. For more demanding tasks, simply slide it into the robust outer handle.

Ergonomic TPU Body: The outer handle is designed to be printed with flexible filament (TPU). This provides an excellent grip, shock absorption under pressure, and a secure friction-fit for the inner module.

Smart Storage: Hidden in the back of the TPU handle is a convenient storage compartment for spare standard utility blades. It securely closes with a dedicated end cap.

Reliable Locking Mechanism: The blade carriage features a built-in locking button that firmly secures the blade in both the working and safe (retracted) positions.

Easy Assembly: The compact inner knife consists of just 3 printed parts (main body, carriage, locking button) and features intuitive, tool-less, and glue-less assembly.

⚙ Recommended Print Settings:
Inner Knife (Main body, carriage, lock button):

Material: PETG, ABS, ASA, or tough PLA (rigidity is required for the mechanism to work reliably).
Infill: 15-20% (for maximum strength of the mechanism).
Outer Handle:

Material: TPU (Flex) is highly recommended to ensure the necessary flexibility, comfortable grip, and a snug fit for the inner module.
Back Cap (Storage plug): * Can be printed from rigid plastic (PETG/PLA) or TPU, depending on your preference for a tight seal.
Supports: Minimal supports are recommended for overhangs.

🛠 Hardware Required:
1x Standard utility blade (trapezoidal).
Lanyard or paracord (optional, the inner knife has a dedicated lanyard hole).

Print it in your favorite colors, mix and match filaments, and don't forget to share your makes!

K1C Two in One Uknife

2in1 Uknife 0.2mm layer, 2 walls, 15% infill

0.2mm layer, 2 walls, 15% infill