Core shell with various filler materials for enhanced thermal conductivity

A component for an electronic device, comprising:

• a first housing sidewall defining an exterior surface of the electronic device, the first housing sidewall comprising:
• a metal outer portion including a first material having a first set of material properties, the outer portion having a thickness greater than about 25 microns and at least partially defining the-exterior surface of the electronic device and an engagement feature;
• and
• an inner portion bonded to the outer portion and including a second material having a second set of material properties independent of the first set of material properties, the inner portion defining an interior volume and at least partially defining the engagement feature, the engagement feature comprising an attachment feature for attaching to a part disposed in the interior volume, the attachment feature defining a through hole defined by the first material of the metal outer portion and the second material of the inner portion;
• and
• a second housing sidewall defining the exterior surface, the second housing sidewall coupled to the first housing sidewall at the engagement feature;
• wherein the inner portion and a pre-formed outer portion form a substantially unitary body.

A composite structure, comprising:

• a first shell material having a first set of material properties and defining a curved surface and a machined engagement feature defining a through hole, the curved surface at least partially defining an elongate exterior portion of an electronic device;
• and
• a second core material having a second set of material properties independent of the first set of material properties and at least partially defining the machined engagement feature, the second core material disposed interior to the curved surface;
• wherein:
• the through hole is enclosed by the first shell material and the second core material;
• and
• the through hole defines a central longitudinal axis generally parallel to the elongate exterior portion.