Quantity   Component name
1 × arduino nano link: https://www.banggood.com/Geekcreit-ATmega328P-Nano-V3-Module-Improved-Version-With-USB-Cable-Development-Board-For-Arduino-p-933647.html?p=E01411629100201406T1&custlinkid=255135
2 × small coreless motor from a small rc helikopter
2 × 1 K ohm resistor link: https://www.banggood.com/Wholesale-Geekcreit-600pcs-30-Kinds-Value-1-14W-Metal-Film-Resistor-Assorted-Kit-20pcs-Each-Value-p-53320.html?rmmds=search&cur_warehouse=CN
41 × 3D printed parts in PLA plastic
1 × 2s 300mah LIPO battery Any 2S lipo will do
1 × flexible coper wire 0.1-0.5 mm you need about 1 meter
1 × superglue
8 × NPN transistor of the C-type
1 × pcb prototype board link: https://www.banggood.com/Geekcreit-40pcs-FR-4-2_54mm-Double-Side-Prototype-PCB-Printed-Circuit-Board-p-995732.html?p=E01411629100201406T1&custlinkid=669188
2 × antenna for bearings
2 × photosensor