The master model is suspended in a box with the gates and vents attached; risers are put on the part to allow air to escape from the final mold.
A na-akwụsịtụ ụdị nna ya ukwu n'ime igbe nwere ọnụ ụzọ ámá na oghere ya; a na-etinye risers n'akụkụ ka ikwe ka ikuku gbapụ site na njedebe ikpeazụ.