F3DM

Could you clarify what you mean by F3DM? The acronym can refer to multiple, unrelated topics, and I want to make sure I produce an accurate wiki-style article for the intended subject. For example, it could pertain to a proposed or rumored aircraft project (often cited as F-3DM in defense circles) or to a term used in 3D printing/manufacturing contexts, among other possibilities. If you specify which F3DM you have in mind, I can generate a concise, neutral article under 300 words.