This is a simple remix of the original Bluetooth speaker tube, made for fitting the Kebidu Radio/Bluetooth/MP3 module. Since the output of the module is not amplified, I realized a very simple stereo amplifier, which is fitted inside the tube. The power supply is given by two 18650 Li-ion batteries in series (about 8 V, needed for powering the Kebidu module).
My printer was not working perfectly, you can do much better!
The Kebidu Radio/Bluetooth/MP3 module that I used is not amplified. I built a very simple stereo amplifier using two LM386 chips, powered by two Li-ion 18650 rechargeable batteries in series (about 8V, needed for powering the module). The default amplification (x20) is excessive and give distortions at the maximum volume, but I was too lazy for reducing it, also the room inside the tube is very limited, everything fits (barely) but no more space inside :-(
I just modified in Blender the tube and the battery cover for fitting the Kebidu Radio/Bluetooth/MP3 module, the speaker' covers have not been changed with respect to the original design.