Figure 1.
CAD of (A) design 1—disc shape (12 × 5 × 4 mm) (B) design 2—torus shape (12 × 6 × 3 mm) (C) design 3—ring shape (9 × 5 × 5 mm) (D) design 4—gummy-bear shape (11 × 20 × 3 mm), all rendered in Blender v. 2.8.
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