Makeblock mDrawBot Faqs page 8

2. Below is the side view. Make sure the tip of the pen is pointed to the center of the
contact surface of the wheel and the ground. Adjust the screw to achieve this goal.
(It's crucial that the tip of the pen is pointed exactly to the center O shown in the
diagram)
The Width(mm) in the software refers to the length of AB (mentioned above), enter
the length and click OK. (Make sure the accuracy of AB)
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