I wanted to make a printable utility knife… but also give it some personality.
The core design is simple, clean, and functional — it fits a standard utility blade, feels good in the hand, and goes together with just one M3 bolt and nut. But the themed liners really bring it together. I’ve made four inspired by versions: a Rebel pilot, an Imperial agent, a classic pink doughnut, and a NASA engineer.
It’s a practical tool with a bit of character — and way more fun to keep around on the bench or in your pocket.
Parts count: 7 + Hardware
Key Features
Functional utility knife with stylish custom liners
Accepts standard utility blades (Stanley-type)
Ergonomic curved form factor for easy grip
Four themed variants:
Rebel Pilot – Inspired by orange flight suits and resistance grit
Imperial Elite – Sleek black and grey with a cold edge
Doughnut Drip – Glossy pink with sprinkle-style detailing
NASA Engineer – Clean, high-vis white and grey with mission-ready lines
Easy to assemble
Blade held securely with a domed M3 bolt
Printing Details
Recommended filaments: PLA+, PETG, or ABS (for strength)
Hotend: 0.4mm Hardened Steel or brass nozzle
Print time: ~43 minutes
Filament usage: ~30g - 40g depending on shell design
Printing Tips:
0.2mm layer height recommended for detail
3–4 perimeters for strength
No supports required
Print shells in contrasting colors or use filament swaps for best effect
Assembly Required hardware:
(1x) 5mm domed M3 Allen bolt
(1x) M3 nut
(1x) Standard utility blade
Apply a small dab of glue to the back end of the spring, then glue it to the inside of one grip piece.Apply glue to the spacer recess on that same grip and press the spacer into place. Add glue to the outer edge of the spacer and either the alignment pin or receiving hole on the second grip.Then press the two grips together to join.Insert the thicker side of the slide button into the slot first, apply a small amount of glue, then insert the thinner side to complete the assembly.Push-fit the M3 nut into the hex recess on the blade guard core body.Place the utility blade in position, insert the M3 bolt through the assembly, and tighten until secure.
warrell72
