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Source : Thingiverse ( STL)
These are Ben Wa Balls for sex play or exercice.
Diameter is 1 inch 2/3 (4cm), it is generally a good size for vaginal use. It is also nice for anal use with a little experience.
It is recommanded to use it with a little cord to facilitate the dildo removal.
Materials options :
Porcelain (Ceramic) is a safe food contact material certified by shapeways. It also adds some weight. This can be interesting for this model. You can order it here :
While ABS or Nylon are a safe materials, 3D printing make it microporous. For hygiene reasons it is necessary that you coat it with a food grade resine. This can be done following this tutorial :