Small-batch CNC parts are usually ordered when a design is still being checked, but the quotation still needs production-level clarity. A prototype RFQ should include drawing revision, material, quantity, surface treatment, tolerance notes and the feature that matters most to the assembly.
Buyers sometimes send only a 3D file and a part name. That is enough for a rough discussion, but not enough for a reliable quotation. If a shaft controls rotation, the drawing should mark runout or diameter tolerance. If a bushing controls location, the bore and outside diameter should be clearly specified. If a threaded insert is used in plastic, the mating screw and installation method should be included.
Clear prototype information helps the supplier quote a realistic machining route instead of guessing. It also makes it easier to scale the same part from sample order to repeat production after the design is approved.