Here is an vintage boombox radio as a pen holder. It's a multipart project so you can combine the colors that you want. The parts fits in the radio body, enjoy printing!

For the cassette you need to use the "Change filament" option of your slicer to obtain the three colors (Black for the base - White for the cover - Red for the stripes). For the speaker please use the back seam position. It's recommended to use manual tree supports only in the holes of the cassete speaker and lateral knob. For te display there are a PDF file with the picture, it's recommended to print it in photography paper to have better results.