I previously posted a tip about making your own soap.
If you do make your own soap you will often have a problem with suitable forms for the soap.
If you want to make round “bars” of soap instead of square or retangular, life often becomes difficult. You will find lots of ideas by searching for soap forms but the best I found was to use a pringles can. The only problem is that you can only use it once, but it is not a real problem if you like pringles.
Simply pour your soap into a cleaned pringles can. Once the soap is set you can tear of the can and you will have a lovely cylinder of soap that you can cut into smaller pieces.