This is a sample of the little drawing robots I created with very inexpensive items. The students were involved in design and testing and as you can see they had a lot of fun with the little drawing robots.
The motor is from a dollar store toothbrush. The markers from the same store. The cup is a used, but washed cup. The lighted candle in a set from the other dollar store. I got the batteries and leads on Amazon. Hot glued the parts together and soldered the leads onto the motor.