Magnetic-Axis Lock Knife II - Quick Deployment - Free 3D Print Model

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Trent Studio

Tools>Gadgets

IP Report

Print Profile(2)

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A1 mini

X1 Carbon

P1S

H2D Pro

P1P

X1E

H2D

H2S

P2S

H2C

X2D

A2L

for utility blades

Designer

1.1 h

1 plate

5.0(26)

OR fully 3D-printed dummy blade head

Designer

1.2 h

1 plate

4.8(4)

Open in Bambu Studio

Boost

391

796

515

299

Released

Bill of Materials

Maker's Supply Kits and Parts

Select all

Round Magnet

M3x10 SHCS Machine Screw (20PCS) - AA159

M3 Socket Head Cap Machine Screws (SHCS)

Carbon Steel Hex Nut

Description

Multiple quick-open methods let you deploy the blade super fast and cool when needed. Once open, the magnetic lock holds firmly—you must slide the release button to fold the blade back.

Magnetic locks behave differently than springs:

Magnet physics: Pull strength peaks when magnets are closest (inverse square law), giving a rock-solid lock. At unlock position, minimal magnetic pull = near-zero pivot resistance for buttery-smooth action.
Spring physics: Least pressure when locked (spring relaxed), most resistance when compressed during unlock—harsh on pivots.

Printing Notes:

Minimal supports needed—only in screw countersinks. Easy to remove with zero impact on functionality.

Assembly Kit

Required:

•2× M3-10mm screws + nuts
•6× magnets (Ø6mm × 2mm thickness)

Optional:

•Stanley blade holder (for utility blades)
•OR fully 3D-printed dummy blade head

Parts Layout & Magnet Installation

Key:

Install magnets in blue-arrow-marked pairs—ensure mutual attraction!

Press magnets flush with recesses → avoid friction from protrusions

Internal Component Assembly

•Position parts as shown in diagram.

•Pro tip:Apply thin lubricant to pivot for smoother actio

Handle Closure & Pivot Fixation

•Close second handle half.
•Lock handle and pivot with M3-10mm screw + nut

For quick deployment, focus on pressing downward with your fingers—not pushing forward

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 (41)

@CrazeeRider

Boosted

Print Profile

for utility blades

Mechanism works well, but the blade is a loose so I modified it by adding a M3x5mm countersunk screw to secure it. Makes the knife a few millimeters wider but still acceptable. The release pin now sits flush and I chamfered the hole to make it easier to get to and slide.

(Edited)

@RK_max

where can I find the blade ???

@CrazeeRider

Boosted

Replying to @RK_max :

It's a standard utility knife blade, you should be able to pick them up from your local hardware store or amazon. https://amzn.asia/d/2QLpitR

@RK_max

Replying to @CrazeeRider :

I have no idea where to find one and I can’t just order one or two of these from Amazon, I don’t have anything else to buy

@MeBoaz

Print Profile

for utility blades

didn’t have right magnets but made it work. beautiful

@Bax04

Print Profile

for utility blades

Great product, I had to edit the model to fit 6x3 magnets since I didn’t have 6x2 :(

@bMissle

hi, can you share that adaption of the model? this is so cool but it was a bummer when my magnets were to thick. help?

(Edited)

@user_3378281537

Boosted

Print Profile

for utility blades

Very Nice

@Chriscut

Boosted

Print Profile

for utility blades

@user_1730098262

Print Profile

for utility blades

(Edited)

@GorfPrints

Absolutely brilliant and satisfying motion! I haven't quite gotten the hang of the flick-close move, but I'm sure I'll get there. Any chance of a revision to the blade mount? the blade has a disconcerting amount of rattle when installed; I know it won't fall out given the way it's designed, but it *feels* like it could. Maybe a hardware mount like in your spring-axis knife?

The designer has replied

@lancezhc

If you're not a skilled knife enthusiast, it's highly recommended to use 3D-printed blades for practicing moves to prevent accidents. Additionally, I can't reinforce the blade mounting method on this knife. According to the design goals, the blade needs to retract fully into the handle when folded, leaving no room for extra thickness to add components. Increasing the overall thickness would create extra resistance and make it harder to handle.

@GorfPrints

Replying to @lancezhc :

thank you for the concern! I assure you I've printed the blank as well for practicing. and that's a shame, but understandable! I'd love to see you incorporate this latch/hinge mechanism into a thicker, more robust design sometime in the future. but regardless, thank you for all the excellent designs! you're really quite gifted with this kind of design work.

@user_1337485453

Boosted

Print Profile

OR fully 3D-printed dummy blade head

This thing is amazing! Addicting to fidget with. Haven't printed it with the real blade holder yet. Love the mechanism!

@3DTeenageGenius

WinterBlade AWESOME! I'm following you

@user_1337485453

Boosted

Print Profile

for utility blades

love this thing, but wish the blade was held in place be a screw or something sturdier than just the printed pegs as it wobbles

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.