A napkin ring with two slidable insert, to customize it with a name, a logo...  with no need of multimaterial capacity. 

You print the insert face down so every face of your model is easy to print. Depending on your filament, you can add a bit more tolerance, the fit is very tight.

On the insert, add a name or a logo on your slicer, add a pause before the logo layer, change filament and here you go.