Simple plant watering funnel/cap for PET bottle
thingiverse
Easy-to-use Watering Funnel for PET Bottles. This cap fits standard PET bottles with a PCO 1881 thread, ensuring a secure connection. A built-in vent system prevents the bottle from collapsing under pressure. No additional supports are needed if bridging is enabled during printing. If water seeps through the thread, try reducing the print resolution to .1mm or apply PTFE tape around the bottle neck for a tighter seal.
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