raschemmel:
It is a circular paper cutout, which is supposed to isolate the circuit board from the floo
Does it look like it might be intended to reduce friction to prevent it from getting stuck ?
No, it is not so badly designed so that the circuit board touches the ground. The problem with getting stuck is that the robot sometimes rest on the two castors and one wheel, making the other wheel spin. It is solved by removing one castor, with the cost of making the robot slightly unstable.