i need help making the 3d design for a 3ds shell not a case but the shell
i think im just gonna cut out shapes from the plastic and reaplace it with diffrent colors
I would think you need to have the measurements for the "guts" of the 3DS that you want to replace the shell with a custom designed one. You also need to know how and where the electronics were mounted in the original shell. Once you know that, either from spec sheets or just measuring it on your own, you can model the new shell to fit over those nominal dimensions. Also, if you are moving any of the switches or placement of the display, you would need to know if the wires will stretch or need to rewire. Try the 123D app to see if you can model it and then prep it for sending to a 3D printing service.
I'm not sure what you mean ? a "case" is a shell
ok i have now and there is not one
Have you tried browsing Thingiverse?