K'NEX Knife and Sheath




About: I am not your average teenager. I like a lot of stuff, and will be posting some more stuff soon. I spend a lot of my spare time gaming, thinking, freerunning and eating :) I AM giving out free patches. (G...

Intro: K'NEX Knife and Sheath

This is a simple knife and sheath (holder).
Comfortable handle.
Easy to slot into sheath.
Long blade.
Unrealistic looking handle :(
You can't kill people with it.

Let's get started!

You will need:
18 White
12 Blue
6 Red
4 Green
1 Grey
1 Bendy Grey

13 Dark Grey (One Way)
13 Orange
8 Yellow
5 Light Grey (Two Way)
4 Green
4 Red
2 White

17 Tan Clips
16 Blue Spacers or 4 Grey Spacers and 4 Blue Spacers
4 'Y' Connecters
2 Blue Clips

Step 1: Knife

1. Make this
2. Make this
3. Attach like this

Step 2: Sheath

  1. Make these
  2. Add these
  3. Make these
  4. Put together like this
  5. Add there
  6. Connect this
  7. Add these
  8. Flip, then add these.

Step 3: Finished

Well done!
Have a buscuit!
Anyone who posts pictures of their finished one gets a patch!

Nutrition Man



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    23 Discussions


    1 year ago

    I think that this is the best knex knife on instructables.


    5 years ago on Introduction

    So easy to remember that I went to my room and built it after analyzing the first pic. Anyways, still trying to mod it to kill ;) still attempting but excellent work on making the knife. I don't care at all for the sheath since I am more of a pocket weilding kind of dude. I modded it with a stronger main grey rod (not the stretchy one), grippy handle, and added slight seradedness on the back (filling the blank areas with the tiny single slot blue connectors on the back and replacing one of the tiny blues near the top with a pin one.) 5/5 stars :D

    1 reply