- PLA or ABS or your favorite other filament - small breadboardable Arduino-compatible controller (Teensy, Trinket Pro etc) - half-size solderless breadboard (preferably with two power rails and adhesive bottom) - L293D motor driver chip or equivalent - two-shaft gearmotor - micro servo - ultrasonic rangefinder - axle and wheels - small USB charger or 6.6/7.4vLiPo battery - 7805 voltage regulator (if using LiPo) - IR remote control receiver (optional) - slotted optical interrupter (optional) - rubber bands or tires - zip ties - jumper wires