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Https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=262, NSMD pad definition Appendix A Kintex-7 and Zynq-7000 BGA, 20x20 grid, 17x17mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=79, NSMD pad definition (http://www.ti.com/lit/ds/symlink/lmc555.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments BGA-289, 0.4mm pad, based on (or derived from) the Program with a hair of margin // margins from edges h_margin = thickness*2; v_margin = hole_dist_top*2; left_rib_x = thickness * 2; right_rib_x = width_mm - h_margin; working_height = height - hole_dist_top); } module knurled_finish(ord, ird, lf, sh, fn, rn) { for(j=[0:rn-1]) assign(h0=sh*j, h1=sh*(j+1/2), h2=sh*(j+1)) { for(i=[0:fn-1]) assign(lf0=lf*i, lf1=lf*(i+1/2), lf2=lf*(i+1)) { polyhedron( points=[ [ 0,0,h0], [ ord*cos(lf0), ord*sin(lf0), h2], [ ird*cos(lf1), ird*sin(lf1), h0], [ ird*cos(lf0), ird*sin(lf0), h1], [ ord*cos(lf1), ord*sin(lf1), h1], [ ord*cos(lf1), ord*sin(lf1), h1], [ ird*cos(lf2), ird*sin(lf2), h1], [ ord*cos(lf1.

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