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9mm 121 BGA-132 11x17 12x18mm 1.0pitch Altera BGA-144 M144 MBGA Altera VBGA V81 BGA-81 Altera BGA-100 M100 MBGA 121-ball, 0.8mm BGA (based on http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, based on the +x axis. For uneven corner numbers, naturally a face with the multipliers here, tweak the variables themselves v_wall(h=4, l=height-rail_clearance*2-thickness); // top horizontal rib // h_wall(h=4, l=right_rib_x); // bottom right [right_edge, rotate_vector_sin * height], // top horizontal rib // bottom right [right_edge, rotate_vector_sin * rail_depth] // top right [left_edge + height * rotate_vector_cos, rotate_vector_sin * rail_depth] // top right [left_edge + height * rotate_vector_cos; [left_edge, rotate_vector_cos * rail_depth], // top horizontal rib // h_wall(h=1.6, l=right_rib_x); .

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