My side hobby, making customised 3D Printed tap handles for the local brewing community. My prices are only to cover my costs, 3D filament, a bit of labour and other consumables. You can print in many different matrieals. The ones included in my prices are:
Plastic (PETG), your pick of colours, White, Black, Grey, Red, Green, Yellow, Blue.
Wood, a bamboo infused plastic, that you can sand and stain.
Exotic finishes (PLA) that may attract a minor additional cost depending on quatity:
Marble
Carbon Fibre
Glow in the Dark
Transparent. (Well, milky transparent)