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

For the speaker and control cover you need to use the "Change filament" option of your slicer to obtain the two colors (Black/White for the speaker cover and Gold/White for the control cover). For the speaker cover please use the back seam position to avoid problems printing the net.