Based on Sidewinder inspired Utility Knife designed by @mroven .

The hardware used is consistent with the original, so you can directly use the materials you already have:

• (5) M3x16mm screws
• (1) M3x6mm screw
• (1) M3 hex nut
• Standard Utility blade

Here's the changes:

Upscale to 110% for other changes.

Move the screw to the bottom, now it looks cleaner.

The thicker blade body eliminates the need for holes on the surface for the screws.

Thanks to the notches added to the blade, this knife can now be fully extended.

Add support blocks on the inside of the blade to prevent deformation of the blade when squeezed hard, which would increase resistance.

Thanks to the larger volume, the blade no longer touches the rear parts, which provides better protection for the blade.

The redesigned slide slots on both sides of the blade can further provide a locking effect.

Adding printed washers on both sides of the blade significantly improves the smoothness of rotation.

The blade cover has been enhanced with some textured decorations and reduced gaps to secure it more safely.

Follow this photo to assemble it, dont forget the washers! 

Click the "Assemble" button to view the assembly method (it's very easy!)