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Tuna Can Palm-Knob Drain Press
A 79 mm perforated press disk with a 34 mm palm knob. It drops inside a standard 3 in tuna, chicken or pineapple can (about 83–87 mm inside the rim, so there is a 2–4 mm gap all round) and squeezes the liquid out through 36 drain holes (3.5 mm) without you holding a sharp lid. Four radial ribs keep the 3.5 mm disk flat under palm pressure. It prints flat with the pressing face down, so it needs no supports.
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