This is a Last for a U.S. size 10.5 foot. It features a 2 piece design for easier removal. (haven’t tested yet so I don’t know if it works.) If you import this to a slicer or CAD software and it’s too small or too big for some reason, both pieces put together should be 275mm long, 105mm wide, and 84mm tall. The first two files are an STL of each piece separately, or you can download the third file, which is both of them as one STL.
