The 3D design I’ve made for the headphones is made out of two main parts. The headband and the speaker cups. Each cup has the main enclosure and 3 covers. The top ring for the cushion and magnets, the middle ring to close the case and the bottom ring for the bottom magnets. They sandwich like this in between and then it gets closed with the enclosure and the speaker would be ready. The design is simple but looks quite well and for sure I will make different enclosure designs in the future for the same PCB.

The left and right enclosure are not the same. Inside the right one we also have space for the electronics and buttons.