One disadvantage of FDM parts are that they are usually weaker than injection molded ones because of how the extruded lines have to fuse together rather than just being moulded in one piece.

Wow, there are some really in depth and great replies thank you everyone.

Right now for my use cases some of the advantages I see are:

1. Rapid Prototyping
2. Using FDM where injection molding would struggle, examples include articulating toys.
3. Low volume production runs

Does anyone have a multi-filament printer? I am not quite sure how this would compare with injection molding, but I am able to get relatively fine color changes on a single part. See picture of an earring that I am prototyping.

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