There are several bench hooks out there. But I didn't found a strong one. So I designed it on my own. As a central reinforcement I used a metrical M10 srew with 45mm in length. To protect the blades of hand planes I put a lid on it. The thumbweel was taken from https://www.thingiverse.com/thing:2259838/ and enlarged. Everything is a little bit tight and you will need a vice or someting to put the lid on the body and to press the nut in the thumbwheel. But this is important to strengthen it. I tried to destroy it with a 200g hammer but I failed ;-) .
For the body it might help to "Allow single extrusion fill" for small walls in advanced settings if you use simplify3d.