An Instructables build by [Rvanderouderaa] shows how far DIY speaker-making can go: a 3D printed frame and cone paired with a suspension made from papier-mâché built from wet toilet paper and a 3D printed mould—aimed at creating a speaker whose impedance varie
A loudspeaker looks simple from the outside—until you try to build one and realize the hard part isn’t the coil or the cone. It’s the suspension system that has to hold everything in place while still letting the speaker move smoothly forward and back.
That challenge is exactly what [Rvanderouderaa] dug into with a new Instructables post. The design pairs a 3D printed frame and cone with a suspension made using papier-mâché formed from wet toilet paper. pressed around a 3D printed mould. The choice is practical and oddly elegant: 3D printing provides the rigidity. while the corrugated suspension is meant to behave like the moulded thick paper found in many moving-coil speakers.
In moving-coil speakers, a coil of wire sits in a radial magnetic field. Current through the coil makes the coil—and the attached cone—move, producing sound. The post focuses on the component that’s hardest to replicate by hand: the suspension system. In this build. the suspension is described as a circular corrugated sheet. made from the toilet-paper papier-mâché. designed to flex while keeping the cone aligned.
The post also makes a specific technical claim: the speaker design is said to have an impedance that varies by volume. It’s a detail that matters if you’ve ever wondered why DIY speaker builds don’t always behave like you expect once you start driving them.
There’s a catch, too. The build doesn’t include a demo video, so there’s no direct sense of what it sounds like. What you can judge is the workmanship: making a recognizable and working speaker from scratch is the headline achievement here, even without audio to play back.
For now. the most compelling part is the method—especially the decision to build the suspension with toilet-paper papier-mâché and to shape it with a 3D printed mould. If speakers are your thing. this is the kind of project that pulls attention away from polish and toward the mechanics of how a speaker actually comes together.
DIY speaker Instructables 3D printed speaker moving-coil speaker suspension system papier-mâché toilet paper speaker build impedance varies by volume