For this, the author took three small electric motors.
A piece of old double wire.
Old CD discs.
The author glued a couple of disks among themselves, pasted a small bearing into the hole and installed an axis in the bearing.
Then he took two tablets.
And he made a hole in the plank for less.
Then I installed a disk with an axis in this hole and fixed the axis with glue.
The disc should not fit snugly against the plank.
Then the author took another disk and glued a double wire around the edge.
Then he glued this disc to the disc on the plank.
Then he made a through hole, and set a small nail with a hat cut off and fixed it well with glue. It will serve as a pen.
Further, the author glued a plate with disks to the second plate as shown in the photo below.
And also, he glued the motors to the second plank.
On the second motor, the author was wearing a plastic pulley and fixed with glue to the motor axis.
The author connected the motors in this way: The positive wire of the first with the negative of the second, and the negative of the first with the positive of the third.
The remaining wires, plus the second and minus the third, the author connected to the plug of the charging wire.
In order for the wires not to be shorted, the author glued all the connections with hot glue.
The author will use clerical gum as a belt.
Test.
Thank you all for your attention. See you.
Video homemade: