Umikot V2 54 mm Breville version - split parts

Split and correctly orientated STL files for the Umikot 54 mm/Breville version. I have not made any changes to the models , only re-organised them to remove any confusion in printing them (e.g. if using a unfamiliar 3D printing service). Print 1 of each part and follow the original instructions for assembly. Consider using the spin grip by Zilerd rather than the handle for a smoother turn, although it currently lacks the stationary outer needle of the Umikot V2 spin ring.