After dealing with the flexing aluminum supports that allowed the whole robot to wobble for so long, I finally went ahead and bought steel tubing. The legs are also longer, allowing expansion of the drawing field. Unfortunately, they are also taller, so for now, the paper needs a little booster to get it to the optimal drawing height.
|Phone books to lift the paper to the pen|
The tubing is connected by gusset plates, made of .03" galvanized steel.
|Slots in the plates for adjusting exact lengths|
Now the bot is so sturdy I could probably stand on it and it would hold.