July 2, 2026
Description
Upgrade your toolbox with this rugged, fully 3D-printable utility knife! Designed specifically for standard 18mm snap-off blades, this knife combines ergonomic design with heavy-duty functionality. Whether you're opening boxes, cutting cardboard, or doing precision craft work, this tool provides a secure and comfortable grip.
Smooth Sliding Mechanism: Easily extend and retract the blade with the thumb slider.
Adjustable Lock: Features a robust locking mechanism (knob) to securely clamp the blade in place. No more accidental blade retraction during heavy cutting!
Built-in Blade Snapper: The back end of the handle features a specially designed slot. Just insert the dull end of the blade and safely snap it off along the factory score line to get a fresh, sharp edge.
Ergonomic Textured Grip: Designed with a patterned surface and finger grooves for maximum control and slip resistance.
1x Standard 18mm snap-off utility blade.
No Supports Required: All parts are designed to print flat on the build plate without any messy supports.
Material: PETG, ABS, or Tough PLA are recommended for durability, especially for the locking mechanism and the blade snapping slot.
Infill: 20-30% (Grid or Honeycomb) to give the knife a solid, weighty feel and prevent the handle from flexing under pressure.
Walls/Perimeters: Use at least 3 wall loops for maximum strength around the blade channel and locking thread.
Print it in your favorite dual-color combination and never buy a cheap plastic box cutter again! Please share your makes and let me know how it cuts!
License:
Creative Commons — Attribution — Noncommercial — Share Alike
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