Okay, if you are looking to build a K'nex differential. Then I probably do not need to tell you what it does.
If you don't know what a differential is, watch this video.
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Step 1: Gathering Materials
This is one of the smallest K'nex differentials. Also This doesn't use a lot of parts.
Following is a list of the required Parts
6x Blue 7 pins connector
6x Purple 4 pins connector
2x Yellow Half round connector
8x red quarter round connector
7x White round connector
2x orange 2 pins straight connector
2x Red rod (5 1/8 in)
10x yellow rod (3 7/16 in)
7x blue rod (2 1/4 in)
5x white rod (1 5/16 in)
20x Green rod (3/4 in)
8x light blue spacer
6x gray spacer
1x yellow gear wheel big
2x yellow gear wheel medium
2x grey gear wheel small
Total Part count: 94
Step 2: Building the Gear Room
Okay this is an easy step. I suggest First making the blue rod with the 2 yellow gears. Then building the housing around it.
Step 3: Axle Assembly
Now, time to make the two axles.
Step 4: Diff Stand
The last step is to make the stand so you can present it (for instance).
Step 5: Final Product
if you correctly followed my steps you should end up with something that looks like this
Second Prize in the
Community Contest: Toy Rods and Connectors