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I made an audio thing
(lemmy.world)
0.25mm nozzle, clear PETG, Prusa, 6mm standard headphone jack, upcycled broken bluetooth headphones, three times larger battery, snap fit with no hardware, FreeCAD, 2nd print iteration, listening to it now, no tricks - it holds together firmly and is usable and actually sounds better than the original by a long shot from better headphone drivers I guess or proper soldering, oh and power button built into the flex of the design, OC only posted on Lemmy
What's the board?
Cheapest Chinese Bluetooth headphones from AliEx around 2019. I think it is an AC6905 chip. The toolchain is rather obscure and piecemeal with write-ups on GitHub and eevblog, but that is beyond my interest. This one was too weak to be useful or one of the audio drivers went out or wire was bad. I have a half dozen of these sports ear buds style headphones that have gone bad over the last decade. Even ones that come from the same brand end up having different boards.
From the post, it sounds like it's just whatever they ripped out of an old pair of Bluetooth headphones... So probably a proprietary purpose-built PCB rather than something more generalized like an esp32 or something.