PET bottle funnel with integrated ventilation
thingiverse
A small, versatile adapter designed to fit snugly onto a typical one-liter plastic water bottle. Ingeniously, its ventilation system is cleverly embedded within the funnel's walls, eliminating any risk of damage. I successfully printed this piece without relying on supports, a brim, or raft, and to my surprise, it functioned flawlessly right off the printing bed.
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