Dont print with too fine of a layer height or the layers may fail on the cross support on the front of the bracket. I used 2.4 mm layer height on an Ender 3 to print mine. (My printer is clearly having some issues as seen in the pics) You may need to add supports touching buildplate for the lower corners. Use your best judgement. Mounting holes are 2" x 2". Designed for use with #10 screws, but anything that fits should be fine