Folding Dual Knives - Mutual Sheath

This pair of foldable short knives features a nested blade storage system where the blades interlock within each other's handles when folded. The spatial optimization achieves:

165% blade-to-handle ratio (Industry standard: 85%)

Locking mechanism withstands 1kg+ force without disengagement,The blade automatically locks into position when fully deployed.

Back-lock system remains stress-free in both stored/deployed states, specifically optimized for 3D printing durability

Update: Thanks to @PhilipA's suggestion, we've added a new printing configuration featuring separate handles with magnet recesses at their base. (3mf:Two handles,with Magnet recesses )

These are available for separate printing if needed. 

Additionally, you can modify the original files by adding negative components to create custom magnet slots. Note: The holes you add should be 0.1-0.2mm larger than the actual magnet dimensions (both diameter and depth), depending on your printer's accuracy and material shrinkage rate.

Print Specifications:

Minimal required supports (easily removable)

Key Notes:

Print the provided 3MF file twice to produce a matching pair (non-mirrored identical copies)

Glue only needed for lock mechanism assembly

Assembly Guide:

Bolted Connection

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