Method for manufacturing a blank for a ceramic core (10) for the manufacture of hollow turbomachine vanes according to the lost-wax casting technique, the blank being manufactured by additive manufacture and comprising at least a first portion (20) which is intended to form the cavities of the hollow vanes and at least a second portion (30) which is configured to allow the core (10) to be positioned in a wax mould, the second portion (30) and the first portion (20) being positioned and retained relative to each other by means of a joint portion (60) which is interposed between the first portion (20) and the second portion (30), at least one through-hole (50) extending through the second portion (30), the joint portion (60) and the first portion (20), a first end of the through-hole (50) opening at an outer face of the second portion (30), and a second end of the through-hole (50) opening at an outer face of the first portion (20).
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