This instructable was made by a DIN 2012 member
Step 1: Making the logo
To make the logo, I used a laser cutting machine. You have to have a version of the logo on Illustrator. I had to simplifie the logo. The silicon will take every little detail, but the soap is not as permissive.
Make the logo 5% bigger than what you want to obtain. The silicone doesn't shrink much, but the soap does.
I used a sheet of cast acrylic for this part of the model.
Once cleaned, you should obtain something like this.
Step 2: Making the soap model
I did the soap in two parts to be sure it would work. In the end I will have two molds: the top with the logo, and the bottom (by which I pour the soap). In the upper part (shown on the right) I left an empty space for the logo.
Again, make the model about 5% bigger than wanted to compensate for the shrinking of the soap.
Step 3: Preparing the casting
Make sure you don't use to much glue under the models or silicon might infiltrate underneath.
Make sure you use a lot of glue around the cavities or silicon might leak out.