It's amazing how fabrication techniques have improved in the last few years. Inexpensive hardware, 3D printers, and awesome boutique electronics stores like Adafruit, SparkFun, and Seeed Studio have opened a Pandoras-box of Awesome.
Are you ready to build your robot? Please make sure to read through the entire Instructable before making any purchases - parts are listed throughout.
If you have any questions, let me know - I'll do my best to help. Want to see ROBOB (ROB-OB) in action?
Ding ding ding... let's go!
Step 1: 3D Part Printing
Here's a link to the model on TinkerCAD...
Are you new to 3D printing? Printing all these parts is going to take a good chunk of time - the bigger your build platform the better. To save you a little bit of time, I've broken the model down into printable parts - get all the bits-n-bytes over at Thingiverse.
Like I said, you can use PLA or ABS... here are the types I used.
Blue Pro-Series PLA
White Pro-Series PLA
Natural Pro-Series PLA