"Tri-Fold" gravity knife, utility knife - Free 3D Print Model

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YosaNatural

Tools>Gadgets

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Print Profile(3)

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A1 mini

H2D Pro

H2D

X1 Carbon

H2S

P1P

P2S

X1E

H2C

P1S

X2D

A2L

Default case pattern 0.2mm layer, 2 walls, 35% infill

Designer

1.6 h

2 plates

4.8(28)

Blank Case pattern 0.2mm layer, 2 walls, 35% infill

Designer

1.5 h

2 plates

5.0(3)

Dummy Trapezoid blade 0.12mm layer, 2 walls, 15% infill

Designer

10 min

1 plate

5.0(3)

Open in Bambu Studio

Boost

361

977

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482

Released

Description

This is a gravity knife with a unique mechanism inspired by Fred Perrin Tri-Fold knife AKA Jacob's ladder knife

The knife holds standard utility blades, which are easily swapable.

I suggest using the included training blade until you learn the mechanism. Dont hurt yourself!

The knife might need a little breaking in if it feels tight. deburring and a little lube might help!

Assembly:

Correct blade dimensions (standard trapezoid blade):

Check out my other gravity knife model!
"Dragonfly" Gravity knife

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*** Update 13.2.2026

Modified the blade seating slightly

→ blade seated more securely

***

Comment & Rating (52)

License

This user content is licensed under a Standard Digital File License.

You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.