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Remy the Rat

Bring to life Remy from Ratatouille!

tanisha-agarwalTanisha Agarwal
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A 3D-printed, Arduino-controlled Ratatouille-inspired rat with moving arms, LED eyes, and the ability to hold hair, bringing Remy to life! Initially, we started with an existing STL model, but after realizing it didn’t match our vision, we redesigned it using Blender and iterated through multiple 3D prints. The final version features servo-controlled arms that move randomly, simulating lifelike motions.
In future implementations, we plan to integrate accelerometers so that the arms move in sync with the wearer’s movements, creating the illusion that Remy is controlling them—just like in the movie!

This project features a 3D-printed Remy that is both **mechanically and electronically enhanced. The arms are servo-powered and randomly move to create an animated effect. The LED eyes give Remy an expressive touch.  

Hardware Used:
- Microcontroller: Arduino Nano Every  
- Actuation: Micro servo motors for arm movement  
- Lighting: LEDs for eyes  
- 3D Printing Material: PLA  
- Power: Powered via USB or battery pack  

Build Process:
- 3D Design: Created from scratch using Blender for better proportions and functionality  
- 3D Printing: Iterated through multiple prints to refine size and movement  
- Electronics & Wiring: Integrated servos and LEDs, programmed using Arduino IDE
- Assembly & Painting: Painted the final model for an authentic Ratatouille look and glued the servo motors to the back and glued the rat feet to the headband so it is wearable.

This build successfully brings Remy to life, and with future motion-tracking enhancements, it will become even more immersive! 🐭

remy_ratatouille_cs12.ino

The arduino code for the LED and the randomised arm movement.

ino - 1.30 kB - 03/19/2025 at 19:04

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remy_left_arm.stl

The 3D final Blender design for the left arm.

Standard Tesselated Geometry - 126.35 kB - 03/19/2025 at 19:03

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remy_body.stl

The 3D final Blender design for the body including space at the back for micro servo motors and holes through the back of the head for LEDs for the eyes.

Standard Tesselated Geometry - 772.54 kB - 03/19/2025 at 19:03

Download

remy_right_arm.stl

The 3D final Blender design for the right arm.

Standard Tesselated Geometry - 126.35 kB - 03/19/2025 at 19:03

Download

  • 1 × Arduino Nano Every microcontroller
  • 2 × Red LED lights for the eyes
  • 1 × Breadboard Electronic Components / Misc. Electronic Components
  • 2 × Micro Servo Motors for the arm movements

  • Week 9 (Final Week)

    Tanisha Agarwal • a day ago • 0 comments

    We finally got a model of Remy printed that we were satisfied with and we painted it to look like the rat. We added the servo motors to the back (glued it using a glue gun) and then added the LEDs. We wrote down the Arduino code for movement of the servo motors and to adjust brightness of the LEDs and soldered the wires so we could keep the battery-powered arduino in the pocket instead of a headband. We have a working model of Remy!

  • Week 7 and 8

    Tanisha Agarwal • a day ago • 0 comments

    We worked on the Blender models - trying to create different version of Remy and 3D printing them. Once we had a model that looked like the rat we decided to make holes in the eyes so we could fit LEDs there and have space hollowed out in the back of the rat so that we could attach the servo motors there. Once we printed the rat we realised that the arms were too big and since we had just made donut like structures for the hands, it looked unrealistic. We will focus on these features to change and print the final model next week,

  • Week 5

    Tanisha Agarwal • 02/08/2025 at 05:43 • 0 comments

    We focused this week on learning Blender, but faced serious time constraints due to midterms coming up and getting behind on homework. We started watching tutorials by "Blender Guru" on Youtube and don't think the process will actually be as hard as we were worried about. This should make it a lot easier to include slots for the LEDs and change the arm motor design. Additionally, we have decided to scale up the rat quite a bit.

  • Week 4

    Tanisha Agarwal • 02/08/2025 at 05:43 • 0 comments

    After the meeting last week, we realized that editing the mesh file @shebuildsrobots has on her GitHub is not very feasible... when we tried to upload our CAD file to the 3D printing software (Orca), the design would change and random holes were added to Remy's head, and we had countless issues with spiraling and sizing. Instead, we opted to design the rat ourselves from the ground up using Blender. The focus for this week will be starting on Blender tutorials. Since this is a pretty major bottleneck in our project, we are cutting down on our goals to get rid of the accelerometers and are now instead going to have the arms move randomly using only the arduino nano every.

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