I make my models using beeswax from a beekeeper who lives near St Andrews. She and her bees make lovely wax that smells delicious and is just right for making models.
I started small but wanted to make fine models to challenge the techniques. I made finger tip rings by dipping my fingers in the melted wax. These then need to have pouring stalks added (sprues). They are then ready to be dipped in the clay mix to build up the mould.
After successfully casting finger tip rings I moved on to small bowls which were made by dipping clay bowls in wax and adding pouring stalks.