Print with 30%-50% triangular infill and .05 or .10 layer height. The screw holes are designed for Grip Rite #8 x 1-5/8 in Wood Screws. For more strength, adjust the hold to an upright position, with a slight lean to the side that will be facing you when it is on your wall as shown in the picture below.

The author marked this model as their own original creation.