Hi Coraline, I have not tried all heavy cream because I find ice cream made with all cream can have an odd mouth-feel when frozen (the texture of the frozen fats can leave a coating inside your mouth as you eat). I find the texture isn't as great, nor the eating experience. For this reason, I always use a combination of cream and milk and I tend to use a little more milk than whipping cream, actually. I hope that makes sense! If you do give it a try, let me know how it goes!