I am having problems drawing on your system.
I am not keen on the PCB curves when i am trying to get smaller and smoother than a normal PCB
I hope this shows, its not to size yet, but should be about 2cm disc
i think you guys call it a encoder
![enter image description here][1]
[1]: /editor/20171119/5a11670cc819d.jpg
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
