Waving Bob

To any SpongeBob lovers out there, or anyone who is looking for a little funsies to make your day, meet Bob. I have been looking for figures and stuffies to make my dorm look cozier, and I came across this idea to 3D print a SpongeBob that can interact with me - like those lucky cats in Chinese restaurants.

So here, I bring you the Waving Bob, a friend watches over your room when you are gone and says Hi whenever you want it to.

1. 3D Printer
2. Stepper Motor
3. Arduino Uno Microcontroller
4. Any CAD tool (Autodesk Fusion 360 in this case)

Make a CAD model of your liking, can be various sizes and shapes depending on your preference and the size of your stepper motor.

But be sure to include a slot for the stepper motor on the "arm" and also to leave space to fix the stepper motor on the "torso".

Also don't forget to leave about 0.5-1mm of wiggle room for the nose and arms/any separate body parts!

3D printing the model laying flat is usually the quickest (least support material)

Writing an Arduino code that will allow the motor to turn back and forth a certain angle depending on your design

Here is a tutorial/guide for stepper motor

28BYJ-48 Stepper Motor with ULN2003 + Arduino (4 Examples)

Now we can put together the stepper motor circuit and attaching it to the SpongeBob.

Also remember to smile :)