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+ pad, top_rounding_radius + pad); rotate_extrude(convexity = 5, $fn = top_rounding_faces cylinder(h = stem_transition_height, r1 = stem_radius, $fn = setscrew_hole_faces); // @todo Calculate the convexity values based on http://www.latticesemi.com/view_document?document_id=213 BGA 0.8mm 9mm 121 BGA-132 11x17 12x18mm 1.0pitch Altera BGA-144 M144 MBGA Altera UBGA U324 BGA-324 BGA-624, 25x25 grid, 21x21mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32l031f6.pdf WLCSP-25, 5x5 raster.

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