Fidget Knife (3D Printed)

This is my Double Action - OTF Fidget Knife. If you want to build one yourself, you can find the 3D print files here:

[peakflareshorts]

The first time I came across something that really made me want a 3d printer

[aaronlandry]

This is an awesome mechanism for an assassin's Creed cosplay.

[ShellShock]

This is actually an amazing training aid to show how an OTF actually operates

[nickdee]

Worked perfectly off the hot plate. Great design and a quick print, perfect!

[imnotjsus]

That's why I'm so stunned by engineers. There is so much beauty in that sudden simplicity.

[Spartacusse]

Finally, people taking advantage of the shapes only possible with 3d printing, instead of trying to copy injection molding design along with a truck load of screws. Thank you Sir, and congratulations of the design.

[blitzkreg]

2:29 YEESSS this is exactly what I wanted to see.

[andrewglick]

This is such a beautifully elegant design. Amazing use of 3D printing for the compliant spring and the double latch. Truly, well done!

[Stagmuffins]

Just printed this out along with the spring enclosure for my first print on my son's A1 mini. It blows my mind how easy it was. The thing even changed the filament colors for me. Feels so close to the Matter Replicator things in Star Trek.

[reignandbongao]

One of my first designed from scratch projects with my 3d printed back in 2018 was a dual action otf knife inside of a id lanyard. It has so many small parts, mid frames, using rubber bands as the spring and is generally janky. I can say, with utmost certainty, that I really appreciate how optimized and streamlined this design is.

[jeffers]

Now do a video of all the prototypes and their issues

[EpicVideos]

I can totally see kids buying that. Perfect toy. It's fun but also knife shaped. And kids love knives.

[justafellagaming]

Thank you for hitting turbo when playing with the finished product, I needed that

[THE_MoshiFever]

A very simple yet rather elegant design, so mechanically simple yet it functions so well even fully exposed, gotta love mechanisms that work

[BloodyMobile]

"Any sufficiently advanced technology is indistuingishable from magic." - that's what I felt like when that thing snapped back into itself.
Because until now, I had no idea a sprring loaded mechanism could be designed bi-directional. Aka, it seemed like magic 🦆

[KrisAdamsTV]

My friend, this little thing is awesome! I printed myself one in a snazzy white body with red blade. It looks awesome and once I had given it a few good goes to smooth the mechanism and shave off any loose plastic, it is working against gravity even. Really really amazing design!

[nirodha]

All I can say is: legend :-)

Absolutely love the simplicity (complaint mechanism design)… doing something this complex in only three parts which make full use of the abilities of 3D printing is just wonderfull. And it doesn’t need to be stronger since it’s a toy! Well done!

[jonhaze]

Printing one right now as I watch this! I started in additive manufacturing almost a decade ago, 3D printing 6Al-4V parts for Aerospace using EBM (electron beam melting). 2 or 3 years ago I decided to get my own personal machine to play with and ended up with the Prusa MK3S+; it is a great machine and treated me well for a very long time. A month ago I bought the Bambu X1C and holy cow what a difference in speed! I've been so impressed with it that I now also have a Bambu A1 and Bambu A1 Mini to keep it company lol. Also ventured into resin printing with an Elegoo Saturn 3 Ultra.. resin is amazing but the cleanup and post processing is a nightmare, so I don't use it too often. Thanks for the model!

[Chris-liwymi]

Out of all the 3-D printer videos I have seen this is the only one that has actually made me want to get a 3-D printer that is an amazing simple piece of engineering minimal parts at most efficiency and design

[gownerjones]

What a beautiful design, honestly. So elegant, so satisfying. I consider this and the emmett gear bearing to be examples of 3D printing engineering art. Both fundamentally impractical but appreciated only for their aesthetic qualities.