Hearing instrument charger device and system, and a method of manufacturing a holder therefor

A method of manufacturing a charger insert part of a hearing instrument charger device, the charger insert part comprising a holder for holding a rechargeable hearing instrument, the hearing instrument charger device comprising a charger casing having a receiving portion for the charger insert part, and a first charger element in the charger casing, the method comprising:

• obtaining a first virtual model of the rechargeable hearing instrument shaped or to be shaped to at least partly conform to a shape of a portion of an ear canal of a user, wherein the first virtual model comprises an allocated position for a second charger element;
• obtaining a second virtual model of the charger insert part, the second virtual model being based on the first virtual model, wherein the second virtual model of the charger insert part is for manufacturing the charger insert part, such that when the charger insert part is placed in the receiving portion, the first charger element will be in a relation with the second charger element;
• and
• providing the second virtual model for manufacturing the charger insert part based on the second virtual model.