Back-Lock Folding Knife - Free 3D Print Model

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Trent Studio

Tools>Other Tools

IP Report

Print Profile(1)

All

A1 mini

P1S

P1P

H2D

X1 Carbon

X1E

H2D Pro

H2S

P2S

H2C

X2D

A2L

0.16mm layer, 2 walls, 15% infill

Designer

2.3 h

2 plates

5.0(66)

Open in Bambu Studio

Boost

674

1122

1.6 k

929

Released

Description

This back-lock folding knife references the structural design of the Cold Steel SRK (Survival Rescue Knife). The model requires zero supports during printing. Assembly needs no tools, adhesives, or hardware - components snap together through precision interlocking.

Project Background:
My ongoing research focuses on developing 3D-printable folding knife locking mechanisms that are simple, efficient, and durable.

Key Design Requirements:

The locking mechanism maintains natural state in both closed and locked positions without compression deformation - critical as 3D printed materials lose elasticity under sustained stress.

No Z-axis force bearing capacity - compensates for weak interlayer adhesion in FDM printing.

Print-optimized architecture with seamless integration for other 3D printed components, enabling support-free, hardware-free, and glue-free assembly.

Development Status:
This project represents a successful milestone achieving all specified criteria. Ongoing research will produce additional folding knives with various locking mechanisms in the near future.

Assembly Tutorial (Visual Guide):

3.Snap handle scales together (moderate force required) and secure with this RED component

The strength of 3D-printed knives cannot be guaranteed and they are suitable only for light-duty tasks, such as cutting paper or opening Amazon packages. Unless otherwise specified, all of my knife designs are intended for light-duty use only.

My similar projects, click on the picture

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Comment & Rating (93)

@Bandito24

Boosted

Print Profile

0.16mm layer, 2 walls, 15% infill

great print thank you for the upload!!

@kajimusha

Print Profile

0.16mm layer, 2 walls, 15% infill

very nice fit and functionality

@Mojamtin

Print Profile

0.16mm layer, 2 walls, 15% infill

pretty sweet

@Zovax

Print Profile

0.16mm layer, 2 walls, 15% infill

very nive, cool design. easy and fast to print

@user_3594808001

Boosted

printed very well

@Jay_Foster515

I like how it all steps together pretty easy and I can figure out how to put it together without having to look back at the pictures. my first layer or two didn’t stick well and I had to cut off a lot of hairs between the bristles but overall it’s pretty good. it doesn’t feel like it brushes my hair very good either but it’s a toy. I printed this out of PETG.

@CptAwsm

Boosted

Print Profile

0.16mm layer, 2 walls, 15% infill

@user_3323268413

How do you build it?

The designer has replied

@lancezhc

Assembly Tutorial (Visual Guide)

@user_3323268413

Replying to @lancezhc :

thanks

@user_1201982660

I printed the blad 2 times and failed both but it could just be my Fremont

@user_3511519389

same I don’t know why. I’ll try printing the whole thing and see how it goes

@user_1201982660

I got my printed

@the_a_dore

can this work with pla?

The designer has replied

@lancezhc

yes

@the_a_dore

Replying to @lancezhc :

thanks! Prints well in PLA galaxy!

License

If you want to use this model commercially, please join my membership.

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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.