UPDATE 2025.03.28.: I've updated the settings for better overhangs and printed threads. I've also slightly modified the Inner Shell. Screwing an M5 bolt into the bore of the inner handle to break in the threads is still recommended.

A gravity knife carefully crafted and expediently designed to inflict emotional damage.

Also an annoying fidget toy.

I also hopped on the 3D printed gravity knife craze, I just designed mine with a slightly different approach.

The handle is slightly redesigned version of the beautiful Carrot Gravity Toy Knife remix made by Chris Klepel.

Have you noticed the subtle stylized letters I added to the sides? If not, it's still OK… ;)

Instructions

Printing

Print all parts as they are orineted in the project file. Use a lower layer height for the screws and the blade for finer threads, 0.12 worked just fine for me. Use supports on the inner half of the handle and use 100% solid infill for the blade to give it a little bit more weight. Use supports for the Inner Handle.

I've printed mine using Prusamnet Galaxy Black PLA, Fiberology PLA Mineral Marble and Fillamentum PLA Mellon Yellow. I think they work together pretty well.

Assembly

Chris suggests the use of a tap and die set on the threads. Since my blade is printed horizontally I figured all I had to do is screwing an M5 bolt into the handle to break in the thread. Try not to overtighten the printed screws because they will definitely break.

Happy pranking… I mean printing! ;)