You can use one of the stock speaker holders if you cut or file out a channel for the wires.
If you are 3D printing a chassis, there aren't many limits to what you can do, so the question doesn't have a short answer. You can design it to be modular in a way that will screw, glue, or mate together in a stack, it could be two pieces that clamp together, it could be one single piece, or it could be a combination of any of those. You can also make custom parts to mix and match with more traditional chassis systems like the rod and discs offered here.
This chassis includes a speaker holder with an illuminated "crystal" on the other side of the speaker for a build I'll be sharing soon. It includes some pretty simple shapes and a bit of metal tubing. (it's actually cobbled together from scraps leftover from old projects, which is sort of the theme of this saber) The crystal and black parts are glued together, set screws hold the central core portion to either side, and you can see the screw holes in the metal part. The right side is the blade connector for a pixel blade.
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