Mould tool, method of assembling a mould tool and method of manufacture using a mould tool

A mould layer assembly comprising:

• a carrier defining a carrier mould contact face on a first side, and a temperature control face on a second side opposite the first, which temperature control face is separated into a plurality of tessellated temperature control zones, each zone comprising a fluid chamber at least partially defined by the temperature control face, the carrier defining an insert cavity overlapping a subset of the plurality of tessellated temperature control zones, and not overlapping a remainder of the plurality of tessellated temperature control zones, wherein the insert cavity is defined by a sidewall;
• and
• an insert defining a mould profile for forming a moulded article and an insert temperature control surface that is opposite the mould profile, the insert being disposed in the insert cavity of the carrier such that the insert overlaps the subset of the plurality of the tessellated temperature control zones and such that the insert temperature control surface is in direct thermal contact with the subset of the plurality of tessellated temperature control zones, the insert comprising an insert mould contact face adjacent the mould profile, the insert mould contact face being parallel and adjacent to the carrier mould contact face, wherein the insert does not extend past the sidewall when assembled in the insert cavity.