I didn't say anything about that at all. I only posted what happened to DDD. They are in the same overall sector, although I agree ONVO is more regarded as a bio company on Ameritrade anyway, but we shall see if they are connected more than you think? But we are already down 7% today whether "connected" or not.
NOW again rick, these are NOT my words but: "That was enough to send shares of 3D Systems down 26% Wednesday morning, though it has rebounded a little from there. As well, other 3D printing companies – Voxeljet, Stratasys, and ExOne – all fell in by double-digit percentage points, while Onvo was also down nearly 6%. They, too, rebounded but were still down by Wednesday afternoon." (from the article link below) http://finance.yahoo.com/blogs/talking-numbers/why-the-pain-could-be-just-starting-for-3-printing-stocks-191556279.html
So as you can see they are "connected" at the hip, but NOT by ME and I did sell DDD and still have ONVO and CIMT.
Good luck to all of us. I agree with you that there is a difference in DD and ONVO, BUT MY or YOUR opinions do not matter that much unfortunately.