I design primarily for the Interwar and WWII periods, and in 1:100 scale for 15mm gaming.
These days I print models almost exclusively in resin, but wherever it is feasible I design with tolerances suitable for FDM as well.
The cog was the most common form of medieval Europe vessel, favoured for its cargo-carrying capacity, and its relatively flat, shallow draft that allowed it to navigate both the open sea and up rivers.
This model is designed at 70mm long, which would make it a small to medium sized cog in 1/200 scale, or a large one at 1/300. It is fairly simplified, for use as a gaming marker rather than as a fine scale model.