"Chatty" Easter Egg

This is the shell of an Easter egg and an insert to hold a sound module playing custom MP3 files upon touching the egg. See the included schematic diagram of the electronic assembly for details on how to wire the components. Since I only needed one of those Easter eggs I simply mounted everything on a perfboard (42x52mm²). One could probably simply glue down the components and wire them up, I guess.

Apart from the 3D printed egg shell and the insert you'll need the following components

• (optional) a perfboard or a PCB 
• a rechargeable LiPo battery (3.6/3.7V, ≥250mAh)
• a charger module (e.g. one of those cheap TP4056 modules)
• a JQ6500 sound module
• a TTP223 touch sensor module
• a couple of resistors and transistors (see schematic diagram)
• a switch to select the track to be played
• a (blue) LED (8mm, 0.5W) to illuminate the egg while playing the MP3 content
• a speaker (≤36mm in diameter)

Assembly instructions:

1. Mount the speaker inside the egg shell (to the perforated area) using e.g. some glue
2. Mount the touch sensor to the small rectangular area inside the shell
3. Wire up the electronic components according to the schematic diagram
4. Now mount this electronic assembly to the recess area of the insert
5. (optional) Use the cutouts of the insert to make the charger and the switch accessible from the outside
6. Attach the LED to one of the two rings of the insert
7. Mount the LiPo battery into its holder and connect it to the electronic assembly
8. Connect the touch sensor and the speaker to the electronic assembly of the insert
9. Finally, attach the insert to the egg shell using screws

How to record messages on the sound module:

There is a software utility called “MusicDownloader” for transferring the MP3 files; see e.g. here for more information.

Print Settings

Printer:

Flying Bear Ghost 4

Rafts:

No

Supports:

Yes

Resolution:

0.2 mm

Infill:

20%

Filament:

PLA (natural/transparent)