6 model

Free

Watertight Roundbox using Soda Bottle Cap (PCO1810)

Thingiverse

Free

Water Bottle Twist on Funnel ( PCO1810 )

Printables

Free

Funnel with PET bottle thread

Printables

Free

Cap Twister

Printables

Free

Low-poly bottle cap creature (US 2 Liter/PCO-1810)

Printables

Free

PCO-Bottle Drying Stand

Printables