Home [www.affinitycustommolding.com] Welcome to Affinity custom molding. The "True" Custom Injection Molder. Our 48,000 sq. ft. facility was founded in 1994, it includes an in-house Design and Engineering … Welcome to Affinity custom molding. The "True" Custom Injection Molder. Our 48,000 sq. ft. facility was founded in 1994, it includes an in-house Design and Engineering …