But even still, this largely 3D printed rock tumbler from [Fraens] is unique enough to stand out. To make a basic rock tumbler, all you really need to do is rotate a cylindrical chamber and let ...

But even still, this largely 3D printed rock tumbler from [Fraens] is unique enough to stand out. To make a basic rock tumbler, all you really need to do is rotate a cylindrical chamber and let ...