Cleat for the kayaks, a bit on the larger side, but I also wanted to be able to pick up the kayak with it.
Printed with supports, but upside-down produced the least amount of supports/cleanup. Heavy perimeters, and if interested, a coat of epoxy.
Will need a longer screw to secure, I got some from McMaster-Carr:
Super-Corrosion-Resistant 316 Stainless Steel Socket Head Screw
10-32 Thread Size, 2-1/2" Long, Fully Threaded
92185A230
The author hasn't provided the model origin yet.