If you don't have a heated cabinet then you will never get rid of that slight concavity in the vertical plane and I need to get rid of it. A hole that is 3mm at either end and 2.9mm in the middle is no good for what I need the printer for.
This is done on my Stratasys, absolutely vertical sides and sharp corners. That is what I am trying to achieve then I can get rid of the Stratasys, it is too big.
http://homepage.ntlworld.com/dknpowe...tasys/box1.jpg
http://homepage.ntlworld.com/dknpowe...tasys/box2.jpg
The firmware will treat the heated chamber as a heated bed. The heated bed will not be needed once the temperature is up to around 70C, it will just make things worse. Temperature variation in the vertical plane will always cause distortions in the model but size variation from 70 to 100 is a lot less than 20 to 100.