Thus , models of minor and obscure subjects are often manufactured using alternative processes .
While injection - molding is the predominant manufacturing process for plastic models , the high costs of equipment and making molds make it unsuitable for lower - yield production .
Models of minor and obscure subjects are often manufactured using alternative processes .
While injection - molding is the predominant manufacturing process for plastic models , the high costs of equipment and making molds make it unsuitable for lower - yield production .