About this 3D model

Needed a sprocket cover for my bike so I quick drew one up. Simple but effective. 144mm dia., 4 screw mount pattern. meant to use 3mm self tapping screws to mount. I hope it works for others. I will post installed photos shortly. Updated 2/29/18 simplified it to shorten print time. Also noticed holes were not symmetrical as intended. I corrected and will reprint asap and verify. Thank you!