What are the best methods for creating hollow resin forms to reduce weight?

Creating hollow resin forms is essential for reducing weight in various applications from art sculptures to industrial components. Several effective methods exist for achieving this. Rotocasting or slush casting involves pouring resin into a mold and rotating it to create a hollow shell as the material cures along the walls. This method provides excellent control over wall thickness. Another approach is lost core casting, where a soluble or meltable core material is used to create the void space inside the resin form. For more complex shapes, two-part mold systems can be used with removable core pieces. Some creators incorporate lightweight fillers like hollow glass microspheres into their resin mixture before casting solid forms. For larger pieces, constructing an internal armature or support structure before applying resin in layers can create hollow forms. Each method offers different advantages in terms of weight reduction, structural integrity, and production complexity, allowing makers to choose the best approach for their specific project requirements.