The cases for the key fobs were created using the free version of SketchUp.  Click the green button below to download all the SketchUp files used in this project.

A gender cut out affords space for a translucent insert to be illuminated by the built-in NeoPixel of the nRF52840 board mounted to the underside of the cover. There are sections to hold all the other components.  The 2 halves of the case snap together and are secured with 4 M2.5 screws. The top is 3D printed in blue PLA and the gender icons in white. The icons are glued in place with #16 fast setting clear acrylic cement which works great on PLA.

All the component wiring is soldered. 26 AWG wire with PTFE insulation is used for the data connections. I prefer the PTFE which is more commonly known as Teflon because the insulation is very resistant to heat so it does shrivel up during soldering. A thicker 20 AWG wire is used between the speaker and the amp. It’s best to keep the data wires between the Feather and the amp as short as possible.