fitness barbell 3d model

Create a high-detail 3D printable keychain model of a mini gym barbell. The barbell has a straight metal rod with threaded ends on both sides. On the rod, place round weight plates that are detachable. Each weight plate is circular with engraved text “Fitness” and “5 KG” on the surface. Include three separate weight plates in yellow, red, and blue colors. Add two small round locking nuts for the barbell ends. Attach a small chain and keyring loop to one side of the barbell for keychain use. Design should be realistic, solid, manifold, and optimized for FDM 3D printing. All parts should be separate objects, properly scaled, with no floating geometry. Surface should be smooth with embossed text, no textures, pure geometry only.