This is my gravity utility knife design. I also made a toy blade if you just want to use it as a fidget toy. If you enjoy the design a like or make would be appreciated.

Check out my new Banana Switchblade design here

You can find my other toy knife designs here.

Thanks to FormFutura for providing the High Gloss PLA ColorMorph filament used in this post. I especially like the red and black color morph. You can get some for yourself by clicking my affiliate link

You can obtain a commercial license to sell prints of this here.

Instructions

• I recommend printing in a resolution between 0.2mm and 0.1mm
• The only part that needs supports is the handle.
• The video below shows how to assemble the knife.
• When assembling the knife it is important to note the orientation of the flexing slider. Its sides are slanted so it only works in a specific orientation.
• I would strongly suggest using a lubricant on the flexing slider. It will work without lubricant but its action is much smoother when lubricated.
• The threading on the screw is (M8x1.25) and the threading on the knob is (M5x0.8).
• If the threading is too tight try printing the screw and knob individually or scaling them down in the x and y direction.

Hardware

• x2 4mm M3 screws, specs linked here
• x2 M3 nuts, specs linked here
• x1 utility blade