There are many applications that that can use 3D printer products or parts. This technology is generally used and well suited to one off part or small product runs.
Many vintage or classic vehicles have an array of small obsolete parts. Since not all parts are still available a redesigned and printed part many be one of the only alternatives. Custom parts such as knobs and bezels can also be personalized to give a special touch to any project.
Mounts and support are popular projects. In an application where just the right mount can’t be found, a made to order component may just fill the bill. With proper dimensions a part can be made to order.
Radio Control vehicles and Drones have many applications that can be 3D printed. A popular RC area for custom parts are scale model projects. These are custom RC vehicle that are built to scale and replicate full size vehicles or created as one of a kind such as Rat Rods. Outer contoured body parts, interior pieces and just about anything you can think of. Let your imagination run wild.
Recreational Vehicles and Marine have a number of areas where 3D printed parts can be used. Retainers, cabling channels and fasteners can all be designer and printed.
For Antique products that have to be cast a plug or replica of the part has to be made. Then the plug in used to make a mould to cast the metal part. A CAD designed and printed part reduces the time to make the plug and can be modified or edited quickly if needed.
Enclosure for electronics or part protection is easily done with 3D printing. The enclosure can be designed around the part and an easily removable cover fitted to provide easy access to the contents.