You are not import any to other country, when ship order to customer. So customer or you don't must pay any import taxes.
Does not matter there from you will ship cases. It's not commercial batch or so. It's individual order for personal use for one customer. And all what customer must pay it is shipping price and local customs duties (if case price more then limit) which for different countries is different.
Does not matter there from you will ship cases. It's not commercial batch or so. It's individual order for personal use for one customer. And all what customer must pay it is shipping price and local customs duties (if case price more then limit) which for different countries is different.