4 inch simple speaker box

thingiverse

Check out this straightforward 4-inch speaker enclosure I whipped up in Inventor. There are no pre-drilled screw holes, so you'll need to take care of that yourself. I relied on Apoxie Sculpt to secure the back panel onto the box. As for the speaker hole itself, I'm not entirely sure it's a dead-on four inches, but it got the job done for me.