7 model

Free

Clamshell Rapier

Sketchfab

Free

Clamshell Macbook stand

Thingiverse

Free

Bistable-Spring-Lid Clamshell Removable Bin Tackle Box

Thingiverse

Free

Scallop Shell

Sketchfab

Free

Philips OneBlade rugged travel case

Printables

Free

Clam Shell

Thingiverse

Free

Raspberry Pi B+ / Pi 2 clam shell case

Thingiverse