I recommend studying the video and text guide before purchasing the files and kit.

There are 3 assembly options. An option with an mp3 board, an option with an ESP32 and an option with a ready-made kit and an Alex Geek board (the easiest option to assemble, nothing needs to be soldered or programmed).

Alex Geek Board kit already includes all the necessary components, the board is flashed, you will only need to assemble and plug all the connectors into the board

Bill of materials (BOM) Common parts for MP3 and ESP32

You will need a set of screws.

Aliexpress kit

Similar kit on Amazon

Amazon kit

And also countersunk head screwsand

Also you need bearing 604zz (4x12x4)  aliexpress	spring 0.6mm, 40mm, 6mm  aliexpress
Aluminum tube 35mm x 32mm x 750mm	Aliexpress does not deliver meter-sized pipes, and on Amazon they are sold in 4 pieces and are quite expensive. As a rule, such pipes can be purchased in construction stores. You can also use pipes of the same size made of other materials, such as fiberglass, carbon fiber, PVC, steel (a steel pipe will be noticeably heavier). Amazon

Battery Compartment Parts

Other common components for MP3 and ESP32

MP3 board setup components

ESP 32 board setup components

Printing

Since many people had questions about using modifiers, this time I tried to make the design in such a way that it would be possible not to use modifiers. There is also no need to use supports. I recommend printing with a layer height of 0.2 mm, a nozzle of 0.4 mm, infill of at least 10% grid pattern. wall thickness of at least 2 walls. For the Chanax body.stl part, the minimum infill is 20%, the minimum wall thickness is 3 walls.

Each part is printed in a single copy except for the chain elements (you need 37 chain elements) and the pipe bracket (2 brackets)

I tried to orient all the parts to start printing, but if the part does not fit on your table, try turning it 45 degrees so that it fits diagonally

Assembling the battery compartment

There may also be different design options depending on the batteries you have.
If you already have charger for your battery so you dont need to add charging board in this scheme. Also some 18650 have build in BMS board, so you dont need to solder BMS in this case. And dont use 18650 without BMS its can be dangerous. BMS board prevent battery from overdischarge and short circuit.

Below I will present diagrams for various battery compartment options. For a better understanding of how to assemble and solder it, I recommend watching the video guide

MP3 setup scheme

This setup is easier to implement, but has a number of limitations in contrast to the ESP32 and Alex geek board solutions. This setup does not have 3 audio tracks for switching from RPM to idle. There is no way to monitor battery status, the sound is quieter, and it is also inconvenient to change the volume level.

To prepare triggers you need 2 wires 23 and 50 cm, if you want to make only 1 trigger, you need only 1 wire 50 cm. We solder the wires sequentially to the buttons

To prepare the speakers we need a wire of about 20 cm and also a short wire of about 5 cm for the jumper, we need to connect the speakers in series since the amplifier is designed for 8 ohms resistance, the speakers that I use are designed for 4 ohms. You can also find 8 ohm speakers of the same size and then connect them in parallel.

To make the board work you will need to write the following files to the flash drive

WAV 01 Download

WAV 02 Download

ESP32 setup scheme

Just like for the MP3 setup, you need to prepare the trigger buttons. You need 2 wires 23 and 50 cm, if you want to make only 1 trigger, you need only 1 wire 50 cm. We solder the wires sequentially to the buttons.

The soldering scheme of all components is shown below, the sequence of soldering with wire for more convenient assembly is shown in the video. The video also shows the placement of the boards in the holder and how to insert them.

The diagram shows a slightly different converter, but we use PCM5102A, so you need to use the same outputs as in the diagram.

Firmware of the board

The board firmware is shown in more detail in the video

Download the program for flashing esp boards and unzip the archive https://www.espressif.com/en/support/download/other-tools

Download firmware files

When you launch the program, select ESP32 S3. Plug the USB cable into the board, in the COM port window, select the required port (if you don’t know which one, unplug the cable, check the list of available ports, plug the cable in again, another available port will appear that wasn’t available before, and that’s what you need)

There are only 4 files in the firmware, each file is in a separate folder, the folder name must be copied and pasted into the window opposite the specified path to the firmware file and so on for all 4 files. put a tick on the left opposite each of the 4 files. After that, press START. After the firmware, unplug and plug in the wire again, the screen should work, which means the firmware has been successfully flashed.

Alex Geek board kit

In the finished kit, all the wires are soldered to the components and have connectors that you just need to insert the board. Moreover, all the connectors are unique and fit only the right slot, i.e. it is impossible to mix up the wires. The video clearly shows how to assemble the axe with my board.