I just added the files on here for my Bluetooth speaker. Go take a look: https://www.printables.com/model/280709-portable-bluetooth-speaker
I've been rebuilding my Ender-based bed slinger. It already had the Ender Extender 400 kit on the XY, but I decided to rebuild the base, add linear rails and increase the Z to 400. More work/improvements to come...
I just added the files on here for my Bluetooth speaker. Go take a look: https://www.printables.com/model/280709-portable-bluetooth-speaker