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+// space above hdd available for air flow
+cooling_height = 10;
+
+// thickness of the support bar
+bar_thickness = 10;
+
+// diameter of thread rod used for support
+rod_diameter = 4;
+
+// dimensions of HDDs; not model-specific; current values are fake
+hdd_width = 80;
+hdd_height = 30;
+hdd_length = 100;
+
+// dimensions of the L-shaped rail between front and back
+rail_width = 15;
+rail_height = rail_width;
+rail_thickness = 1;
+
+// dimension of a single hdd tray (hdd + space around)
+tray_height = hdd_height + cooling_height + rail_thickness;
+tray_width = hdd_width + bar_thickness;
+
+pla_epsilon = 0.1;