Just a simple hook. If you print it in the intended z-direction (see print bed gallery file) it is quite sturdy and there shouldn't be any delamination problems between layers. The attachment bores are for countersunk screws and arranged such that they are accessible for drilling and mounting the screws without any parts of the hook interfering.

The supplied stl is for a 60mm length hook, attachment bores are for 3mm countersunk screws.

The scad file is supplied and is parametric. The scad makes use of the hull construction technique I find quite useful.

This hook was inspired
by Parametrized wall-hook
by q_h http://www.thingiverse.com/thing:29889,
but the scad was written from scratch.

You can either print the supplied 60mm hook stl.

Mine was printed in PLA with 25% infill and is quite sturdy. The attachment bores are for 3mm countersunk screws.

Or adjust the supplied scad file to your specific needs (adjust the Pxx params).