Assemble using instructions at http://plotterbot.com/2013/12/how-to-build-a-tiny-3-axis-cnc-drawing-robot/.
Since the instructions are for version 0.29 and you printed 0.30, you will need to make the following changes:
The pen plotter arm will plug into the holes on the Z axis. Put one at the top, and another at the bottom. Look at the picture above. Secure the plotter arms in the z rack with a drop of superglue each.
Use the cross-shaped head that comes with the stepper motors, put the gear on the cross-shaped head, and screw it in. You don't need to use the rubber gaskets.
Attach the Z-axis motor to pin 13, the Y-axis motor to pin 12, and the X-axis motor to pin 11 on your arduino.
I put an AA battery on the gantry for counterbalance so the bot doesn't tip over when the y-axis is extended.
Use the Software guide here: http://plotterbot.com/tiny-cnc/challenges-entered/drawing-robot-afron-ultra-affordable-educational-robot-2013-design-challenge-entry/tinycnc-drawing-robot-software-user-guide/
In Inkscape, make your document be 6" by 4". Only draw in the right upper quadrant. The other quadrants have negative coordinates and will not translate with the processing sketch. Read the instructions referenced above to make sure you have a drawing that will convert well to gcode. Save As... gcode, and remember the file name.
Load the arduino sketch to your bot.
Load the processing sketch. Change the file name to the file name of your gcode in two places. Run the processing sketch... and it should draw.
Things that need to be fixed:
Decrease the play in the axes
Keep the gantry from popping out of the x rack