I’ve been looking a while for a parametric hook modeling, but I didn’t found any available model that ideally combines strength and customizing possibilities. So I tried to create the model I wanted. This is an attempt for a universal and very strong parametric hook, easily 3D printable as a "finished product".I did a "stress test" with my parametric U-Hook in its default configuration. The hook had been printed in PLA, with 2 perimeters, 0.2 mm layer height, and 20% infill. It supported a weight of 47,4 Kg.Full documentation available as a PDF (in English and French) in the "Documents" section, or on my website : http://www.sergepayen.fr/en/parametric-u-hookTo customize this object, you need OpenScad software (free and open-source). It's very easy if you just want to customize an existing SCAD file. I wrote a little tutorial about "how to use a parametric file", that explain how to use OpenScad to customize a parametric object :http://www.sergepayen.fr/en/how-to-use-a-parametric-file