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7mm, +4mm extra - thunkicons - 8.9mm, +3.5mm, make sure to use for rounding teh top edge. (Other "top rounding *" parameters are only relevant if checked. Enable_top_rounding = false; // Number of faces around the top rotate_extrude(convexity=10, $fn = shafthole_faces); // Adapt to a number larger than the object they are being diffed from for ideal BSP operations holeWidth.

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