I have experience with resin printing. I currently own an Elegoo Mars 2 pro. The resin color can be changed to a non-listed color, but that will require more time for me to buy it.
Zen is located in Nagykapornak, HU. Our test part was printed in grey resin in a timely manner. The piece came out as expected: the surface is accurate, all the key elements turned out just perfect. The dimensions of the item are precise as well.