I designed a coin to use as a tokens for a RPG. I decided to make it from scratch instead of making a height map. I tried two different approaches.
Smooth height changes
I found a 3D model of the head I wanted to use on my coin. Then I cut it in two, and placed on of the pieces flat side on top of the coin. I then flattened the head to make it more appropriate for a coin. When I sliced it whit the layer height supported by my printer I noticed that I lost too much of the details in the head.
Layered height changes
I found a picture of the head I wanted to use and drew outline of the different parts of the head that I wanted to include. I then added each drawing with a different thickness to the coin. This gave me a clear drawing on the coin, and is what I ended up printing.
I printed the coins standing up. 2 of my 42 coins failed because the coin fell over during print. I printed 4 and 4 coins at the time, on placed in each corner of the print surface. I finished one entire coin before starting the next.