For this build you'll need some non printables parts.
Cheap PWM controller : https://tinyurl.com/2byaesey
Lithium charger : https://tinyurl.com/bdzmk3bx
small DC motor with reducter : https://tinyurl.com/3abj9ry9
and a 18650 cell from salvaged battery
The author remixed this model.
I redrew the base to fit my needs.
I have to fit inside a 18650 cell, the USB charger, the PWM controller and obviously a motor.