3D Printed Custom Bluetooth Speaker

For Instructables’ 20th birthday, I decided the best gift I could bring to the celebration was music 🎶.

This is a bluetooth speaker with a custom 3D-printed casing.

This project is simple for beginners to make, but it still looks sleek and sounds great. This is a portable sound system that’s perfect for birthday parties, or any celebrations.

Instructables is all about creativity and making things your own, I wanted to design something functional yet fun: a speaker for you to put together in less than an hour. Here’s how you can build your very own 3D-printed Bluetooth speaker, whether you’re celebrating Instructables’ birthday, throwing a party with friends, or just want a cool self-made gadget for yourself.

Electronics

1. 1x Bluetooth Audio Module, 4 Ohm 3W-5W. Can be purchased here or elsewhere.
2. 2x Speakers - 4 Ohm, 3W each. Can be purchased here or elsewhere.
3. 4× AA Battery Holder - Can be purchased here or elsewhere.
4. 4x AA Batteries
5. 3x Wires - JST-XH 2-Pin Connector Wire which can be purchased here or elsewhere.
6. 8x Screws - 4M Size, Height: 11mm or Shorter

Casing & Design

1. Standard PLA Filament (any color) - I used standard green PLA, but any color works.

Tools

1. 3D Printer - Any FDM printer (e.g. Ender 3, Prusa)
2. Soldering Iron + Solder - for attaching wires to the module and speakers.
3. Wire Cutters
4. Wire Strippers
5. Screwdriver

Take one JST-XH 2-Pin wire. Using your wire strippers, strip about 5-8 mm of insulation off the red and black ends. Twist the exposed wire so it stays neat and straight.

1. Solder the red wire to the positive metal tab.
2. Solder the black wire to the negative metal tab.

Repeat the same process with another JST wire and the second speaker.

Try to apply heat quickly and evenly when soldering, too much heat will damage the speaker tab.

Take the 4×AA battery holder. Strip 5–8 mm from the red and black leads coming out of the holder. Do the same with your last JST-XH 2-Pin wire, twisting the exposed wire.

Now, solder red wire to red and black wire to black.

This makes the battery case compatible with the module’s connector slots.

Now it’s time to make the first connection:

1. Plug the battery wire into the module’s power slot (red port).
2. Plug the two speaker wires into the remaining slots on the module. (It doesn’t matter which speaker goes in which slot.)

At this point, your circuit is complete. Insert batteries, switch the battery case on and test the module - it should power on, and your speakers should produce sound when paired with Bluetooth.

The speakers play a sound when switched on and connected.

Download and load this .gx file or the .gcode file attached below into your slicer or 3D printer. Use standard PLA filament.

1. No additional supports or rafts are required - everything has been include in the file already.

Once printed, use your screwdriver (or any tool that helps) to remove all supports. Ensure that nothing remains in the screw holes on the front.

Disconnect the wires from the module temporarily.

1. Place one speaker over the circular opening on the case.
2. Rotate it until the screw holes in the speaker align with the screw holes in the case.
3. Make sure the side with your soldered wires is positioned above the wire pass-through hole in the casing.
4. Run the wire through the hole, then seat the speaker inside the circular frame.
5. Secure the speaker in place using M4 screws (Height ≤11 mm). You may need to apply some pressure as the screws will create their own thread in the plastic.

Repeat for the second speaker in the other circular frame.

Slide the Bluetooth module into its holder slot on the back side of the case, oriented where the ports are closer to the holes in the holder.

1. Run the two speaker wires through the holes on the side of the module holder. Plug them into the white speaker ports on the module.
2. Run the battery wire through either of the holder’s side holes, then plug it into the red power slot.

Once everything is plugged in, snap the module cover onto the back. It locks into place but can be popped off again later if you need to service the module.

Insert four AA batteries into the holder and close the cover. The battery case's built-in on/off switch now controls the entire speaker system.

1. Turn the switch on to power the module.
2. Pair it with your phone or laptop using Bluetooth (it will appear under a generic name like BT-Speaker).
3. If you want to connect a new device later, simply “forget” the old one in your Bluetooth settings and reconnect.

Congratulations: you’ve built your own DIY 3D-printed Bluetooth speaker! 🎶 Perfect for birthdays, parties, or just showing off your skills.