I have been given a Rigidbot printer which used to work. Using Arduirno software I am unable to get any reaction from the printer except “com3 already in use” but the only thing connected to com3 is the printer. I am new to 3d printing and willing to learn but can’t see a way to fix the problem. Can anyone help?

Come to the google group, it is not as active as it once was but lots of good info.

https://plus.google.com/u/0/communities/117996416225488251038

Thanks very much. The google group looks like it might be more useful.