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Universal Jar-Mouth Fruit Fly Funnel Trap
A cone that sits in the mouth of any jar, glass or bottle with an opening between about 10 and 95 mm. Flies go in through a 4 mm tip into vinegar bait, and the narrow opening keeps them from finding their way back out. It is 108 mm across and 56 mm tall, with 2 mm walls at 43° so it prints flange-down with no supports. Turn it over to use it.
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