Filled hollow structure and tool for manufacturing same

A tool for producing a filled structure comprising

• a first mould half;
• a second mould half;
• and
• a third mould half;
• wherein the second mould half is configured to form a cavity with the shape of the negative of an open hollow structure when mating with the first mould half
• the first mould half is configured for holding the open hollow structure while the open hollow structure is at least partially closed with a closing structure and filled with a filler medium;
• and
• the third mould half is configured to form a cavity with the shape of the negative of an overmould when cooperating with the first mould half holding the filled hollow structure.

A filled hollow structure comprising

• an open hollow structure from a first material;
• wherein the open hollow structure is at least partially closed by a closing structure;
• the hollow structure is filled with a filler medium;
• and
• the filled hollow structure is overmoulded with a second material,
• wherein the closing structure has a hardness that is higher than the hardness of the first material and/or higher than the hardness of the second material.