Replacement Prop nut for a 1960 Evinrude Lark II 40hp outboard. This will likely fit similar outboards from around the same time frame. My local marina was out of stock and BRP (the manufacturer) suffered a cyber attack recently and cannot ship parts, and I was not going to let that o keep my boat of out the water, so here we are.
I printed in PETG with a .2 layer height with supports on the build plate, with 100% infill, though I don't think this was necessary. I also printed one at an angle so the layer lines would not be parallel to the shear pin or the cotter pin, but I found the one printed flat to be suitable strengthwise.
The author hasn't provided the model origin yet.