Box with Lid – 3 Sizes, 0.3 mm Lip Fit

Three lidded boxes at 60 × 40 × 26 mm, 80 × 60 × 36 mm and 100 × 80 × 46 mm, with a lip fit that has 0.3 mm of clearance designed into it rather than left to luck. The clearance is the part people get wrong. Model a lid at nominal size and it will not go on, because every FDM printer lays its perimeters slightly proud of the nominal wall. Model it too loose and the lid falls off. 0.3 mm all round is the figure that works across most reasonably tuned machines: the lid drops on, holds with a litt…

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