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// size of the array
num_hdd_x = 4;
num_hdd_y = 3;
// space above hdd available for air flow
cooling_height = 10;
// thickness of the support bar
bar_thickness = 10;
// outer diameter of thread rod and nut used for support
rod_diameter = 4;
nut_diameter = 6;
nut_height = 3;
// dimensions of HDDs; not model-specific; current values are fake
hdd_width = 101.6;
hdd_height = 25.4;
hdd_length = 146;
// dimensions of the L-shaped rail between front and back
rail_width = 15;
rail_height = rail_width;
rail_thickness = 1;
// assumed space deviation of the resulting form; used to leave space
// in holes so that screws and rods do not stuck
pla_epsilon = 0.1;
// dimension of a single hdd tray (hdd + space around)
tray_height = hdd_height + max(cooling_height, 2 * bar_thickness + 10 * pla_epsilon);
tray_width = hdd_width + bar_thickness;
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