This hook is designed to be strong and quickly mounted from the front. 

For screws:  Spax 3,5x20mm (1x)  and Spax 4,0x45mm

This makes it as strong as possible for a 18mm board.

The sides are rounded for a more even weight distribution.

Measures: 100mm x 62mm x18mm

Print tips:

• use grid infill with a 45° angle like in the picture for max strength
• no supports needed
• 4 wall perimeters