Popper

A fly fishing popper that's about 1" (25mm) long.  It features flats for placing eyes, a tunnel for inserting rubber legs and a groove for aligning the hook.  I recommend a 2 layer wall, 0.2mm layer height and coating with fingernail polish.  Use no infill.  The lighter the filament the better it will perform.  Kink shank hooks work best to avoid hook rotation.  Heat the hook prior to inserting into the groove.