Just a line of text in a rectangular mold. There's some simple drafting to make the bar come out easier, and option to smooth the text a bit... if you want smoothing you may want to download and run the .scad yourself, or, use Customizer and only set to the non-fast option just before making the thing file, even though the preview times out apparently the final make does not. Also on "slow mode" is a texture to make removal from the build plate easier.

So far, we have only tried hot process gel soap in these molds - cool at room temp for one hour and the soap removes easily with a little spatula (same tool I use for 3D print removal from the build plate, actually).