- 4 20mm M3 bolts - 4 M3 hex nuts - A 70 or 80mm case fan Printing Notes: - You might want to manually place some supports below the sharp overhangs next to the cut out for the power input and switch. Assembly Notes: - The hex nuts should friction fit into their holes from the bottom. You can use a screw with a washer to force them into place if it's too tight. - Make sure that you screw the backplate onto the the control box before mounting the fan. Use a normal 70 or 80mm PC fan grill.