3D Printed Bluetooth Speaker

myminifactory

I designed and built this Bluetooth speaker as a summer project for my college dorm. The speaker features two full-range drivers and two passive radiators, delivering loud music with great bass. A battery pack powers the device, crafted by soldering together a protection circuit and three 18650 batteries wired in series to produce a total of 7,800 mAh. A battery level indicator on the front uses four small LEDs, showing that the speaker lasts for at least six hours on a single charge. The pause/play button and volume up and down buttons work perfectly, but you can also control volume and pause music using your phone. Additionally, an audio jack on the back allows you to play music with a 3.5mm audio cable. The speaker is recharged via a 12.6V wall adapter connected through a dc jack on its back. I created this entire project using my TEVO Tornado 3D printer, including an inner shell that provides a tight seal for the sound and is completely airtight. The outer blue and grey parts are purely aesthetic but give the speaker a professional look. However, upon closer inspection, you'll notice a visible seam in the middle of the blue piece where the play/pause button is located. I printed this vertically, but midway through (after 22 hours), there was a power outage and the printer stopped working. To avoid wasting time and resources, I calculated the remaining print height by taking [current height - initial layer height] / average layer height and modified the gcode to continue printing from that point. It may not be the most attractive seam, but it felt incredibly satisfying to salvage the print and save myself from having to start over.