Possible to print with no lines with FDM

Is it possible to print an object with an FDM printer with no visible lines? If so, which printer would I need to get?

Any printer that can do at least 0.1mm layers, at 0.05mm you have to get really, really close to notice the lines between layers. Of course printing at those resolutions takes a long time.

Even at 25 microns, we can see (if not feel) the layer boundaries. That's simply the nature of depositing one layer at a time.

There are post-processes that will make the layer boundaries less noticeable.