Glowing Pulsating 3D Heart

I wanted to create a glowing, colorful heart with a white orb moving around based on how the heart was rotated. Alongside this, I also wanted it to pulsate red when registering a user's heartbeat.

In the end, I was not able to fit all electronics inside the heart and settled for only having the LEDs inside of the actual heart. As such, this is a guide replicating the steps I took. To make everything fit inside the heart, the overall print scale should be around 2000% in Ultimaker Cura.

• 21x - WS2812B RGB LEDs with JST-SM connector
• 2 x - 330 Ohm resistors
• 1x - Arduino Nano
• Female Shield Headers for testing
• 1x - Arduino Uno - For testing components
• 1x - Prototype Breadboard - For testing
• 1x - MPU-6050
• 1x - PulseSensor Kit
• 1x - Piezo buzzer
• 1m 22 awg solid core cable
• 1x - 4xAA Battery Holder
• 1x Red LED
• Solder tin
• Prototyping cables
• 1x double-sided prototyping PCB Board
• 3D printer
• Ultimaker Cura with the Mesh Tools plugin
• ~6-8 meters of transparent PLA filament

• Step 1-1: Download and Install Ultimaker Cura
• Step 1-2: Register an Ultimaker Cura Account
• Step 1-3: Install the Mesh Tools plugin
• Step 1-4: Import the "heart_gem_pt_1_3.obj" file
• Step 1-5: Rotate the model to sit flat
• Step 1-6: Scale the model to 1050% on all axes
• Step 1-7: Go to Extensions > Mesh Tools > Fix model normals
• Step 1-8: Set the print settings to normal
• Step 1-9: Press slice
• Step 1-10: Copy the print file to a usb or sd-card and print the model
• Step 1-11: Repeat step 1-5 to step 1-10 for the "heart_gem_pt_2_3.obj" and "heart_gem_pt_3_3.obj" files.

• Step 2-1: Solder the components according to the provided diagram.
• Step 2-2: Upload the glowing_heart_source_code.ino file to the Arduino Nano

Step 3-1: Glue the "heart_gem_pt_1_3.obj" and "heart_gem_pt_2_3.obj" parts together

Step 3-2: Encase the pcb and battery