Clamshell Fob Frame

Create a two-piece 3D-printable clamshell frame for a teardrop-shaped RFID key fob. The design must follow the exact rounded teardrop/egg outline of the fob and must not have any solid front or back panels. Both the top and bottom pieces should be completely hollow in the center, forming only a thin perimeter frame around the fob. Split the frame horizontally through its thickness into an upper frame and a lower frame. Add an internal U-shaped retaining groove so the RFID fob can slide into the frame from an opening on the wide lower side and remain captured between the two halves. Include a small stop at the opposite end to prevent the fob from sliding through. Add a locating lip-and-groove around the mating perimeter and four small snap-fit clips, with two clips on each long side. Integrate a reinforced key-ring loop at the narrow top end with a circular through-hole. Use rounded outer edges, smooth fillets, uniform thin walls, and dimensions suitable for FDM printing in PLA. Maintain clearance of approximately 0.3 mm around the fob and 0.2–0.3 mm between mating snap-fit parts. The final model should consist of exactly two separate printable solid bodies: one hollow upper frame and one hollow lower frame.

Parameters

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