Found 2 3D-models for “flap box” across many websites

#dispenser#flap valve#window#fully 3d printed#flap#check valve#fully printable#box#flap box#door
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little flap for boxes - sportellino per scatoloni

little flap for boxes - sportellino per scatoloni

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F3P Gas Check Valve [Rev1]

F3P Gas Check Valve [Rev1]

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