The Mini Bot chassis, ready to print. Spin the model, pick a part, download the STL.
Seven printed parts make up the robot's body and wheels. Dimensions below come straight from the CAD model.
| Part | Qty | Material | Size (mm) | What it does | File |
|---|
Print everything in PLA with 0.2 mm layers and 3 to 4 walls, except the tires, which are TPU for grip. The CAD model lists the tire as PETG only because Onshape has no TPU material. No supports are needed when each part sits on its flat face.
The electronics and hardware that go with the printed parts. Links go to Amazon or the maker's own page; any equivalent part works as long as the pinout matches.
| Part | Qty | Notes | Where to buy |
|---|---|---|---|
| M5StickS3 | 1 | ESP32-S3 brain with LCD, microphone, IMU and Bluetooth. Plugs into the HAT. | M5Stack |
| Mini Bot HAT | 1 | Carrier PCB with the buck converter, 4 servo and 4 sensor headers. Order from JLCPCB with the files in the repo. | GitHub |
| FS90R continuous servo | 2 | Wheel drive, 6 V from the HAT's servo rail. | RobotShop |
| LM393 speed sensor | 2 | Photo-interrupter that reads the slots in the printed wheel. | Amazon |
| IR reflective sensor (TCRT5000) | 1 | Line and colour sensing, analog output. | Amazon |
| 12 mm magnetic bead | 1 | Rear caster ball, held by the printed caster mount. | Amazon |
| 4 × AA battery box | 1 | With switch and 5.5 × 2.1 mm barrel plug for the HAT's power jack. | Amazon |
| Female-to-female Dupont wires | 1 pack | Connect the sensors to the HAT headers pin for pin. | Amazon |
| M3 button head screws | 1 kit | Assorted lengths hold the printed parts, servos and sensors together. | Amazon |
| HC-SR04 distance sensor | 1 | Optional. Plugs into the HAT's DIST header for obstacle avoidance. | Amazon |
| SG90 positional servo | 2 | Optional. Pan and tilt for the distance sensor, on the HAT's PAN and TILT headers. | Amazon |