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Calculate the convexity values based on http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, based on the left sub-panel right_rib_x = width_mm - thickness*2; union() { difference(){ color([.1,.1,.1]) panel(width); // waves out wall(h=4, w=width_mm-hole_dist_top-4); // one more to mount the circuit board to, dead.

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