2-U Clamshell Housings consist of 2 U-shaped halves that either snap together (ideal for small enclosures) or that are held together by flat-head screws that are flush with the case. This is the simplest and most cost-effective way to create custom housings ranging from match-box to shoe-box in size. An added advantage is that the top and 2 sides can be printed on in one setup prior to forming the part. Typical uses include industrial controllers, transformers, transmitters, hubs and the like. ABS and PC-ABS are the preferred materials for these custom enclosures.