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This is my second robot- thanks for the comments!
Improvements over Mk1:

Large program length (20 Chain links)
It takes much less of the program to turn (5-6 white pegs instead of 12 in the old one to turn 90 degrees!)
Smaller, more compact design
Quite tough- the old one was flimsy
All-in-one program unit and chassis-yeah monocoque (if you don't know what it means go on wikipedia)
Faster- Bigger wheels
Only 4 red gears because of the direct drive to the wheels

Con's:
Only works well on flat, smooth surfaces because of low ground clearance- so I couldn't put castor wheels on it- I put skids on instead
Jerky movement due to new pick up wheels

You like?
Get buildin'

Video is here http://www.youtube.com/watch?v=xYB7Abs6ojI&feature=channel_page

Step 1:

The Basic frame

Step 2:

Adding the motor

Step 3:

Wheels+Chain Programme
I don't know why this doesn't have more comments.
I guess people aren't interested in robots- instructable users ALWAYS search for guns
It's a real shame, things like this deserve to be featured or at least have more comments.
<p>8 years into the future........totally!</p>
7years into the future... Definitely!
How do you program it?
<p>Ingenious! Maybe I'll use this one day, with the correct credits of course ^^</p>
<p>I built this now, but the chain keeps faling apart and their is too much friction against the white connectors that help the chain a long the bottom.</p>
<p>How many chain links are used? Btw, this is AMAZING.</p>
I know this is a while ago, BUT AMAZING IDEA
I'd like to copy this idea and expand upon it. I'd credit you entirely though
hi this is so cool im gonna build this!<br>
Wow nice! Thats perfect for me, I like both Knex and programming! 5*
I'm sorry if I missed something, but how do you build the chain?<br />
&nbsp;Look at pic 9 on the las step, it shows a light grey connector and a white attatched to chain link, you need to make 20 not 21
Awesome 5* and a sub. It's on my must build list
this is cooool!
try doing twenty chain links
oops, I was meant to put 20- will change to 20
Yaaaa you built another one. 5* and faved<br/>
This is great, 4 stars and favorited.
Really nice man. Will build if I can find time.

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