I've never done this before so I decided to start out easy.
I made a block in Fusion360 that was the same size as the wax block to be machined as the mold. Then I drew some text on it.
I went with some simple text - "LOFT" - as this is the name of my house, and thought it would be cool to put in my house.
I machined the block using VCut and the shopbot mill.
Then I used Oomoo to cast it and left it overnight.
Woohoo, it worked! I used scissors to cut off the extra bits.