There are two parts: the upper part and bottom part. Print the bottom part with support applied and not upper. You can glue them or you can use nails too. This will update to add ultrasonic. You should put an Arduino Uno or others and a driver L298N on the other side. But I highly recommend putting an Arduino Uno.
Bottom_Part.stl | 40.3KB | |
example_-_dont_print_this.stl | 303.7KB | |
Topper_Part.stl | 26.6KB |