Funny... you work for Ivoclar so of course you will say your machine is better. I'm curious to ask you: you launched it at IDS 2017. A year later, still nothing... Plus being hostage to your proprietary mandrels, doesn't look like an open system to me. I want the freedom of milling non-Ivoclar...
I heard there is a $ 3,000 cost to be able to use stl files... I can't remember if it is to export them from Sirona to another system or to accept stl. Can you confirm?
The error doesn't seem associated with the compressor. Also, the recommended air source is for oil-free compressor. Finally, have you contacted the dealer you bought the machine from?