It's a mold for casting a container to cast candle into, made for my friend. I coated everything with primer, then painted and last but not least coated with clear hi-gloss varnish.
For pumpkin casting i used standard building plaster from home depot
You need to print 2x mold parts 1 and 2, and assemble it alternately with mold insert on top. Before assembly i recommend covering insides with thin layer of petroleum jelly. It really makes life easier
Initially i tried to do this in openscad using this as the base, but it turned out to be too complex for the program, so i switched to blender.
The author remixed this model.
Made mold out of it