Roxy, thanks. I implemented most of the above.

I now have a new issue. Pronterface does not extrude. The head follows the path but the extruder does not function. In Cura all works so I know that my Wade extruder is functioning well. I printed a 5mm step torture test in Cura and it came out beautifully. However if I load the same file in Pronterface, no extrusion occurs.

I've never seen this before. Any ideas?