Hmm i use the RepRap Flavor. Although it does not extrude the 16mm before start printing with the second extruder. Could it be my firmware? I generated it here: http://marlinbuilder.robotfuzz.com/
With Cura 14.03 it works fine.
Okay I set the retraction to 13mm. I will give it a try tomorrow.
It seems not to affect volumetric RepRap flavor. Every G10 S1 is followed by a G11.
However, G10 S1 is not (yet) implemented in Marlin. I actually have some code working for that purpose.
@Daid: The code lacks of the proper LCD menu items for the swap retraction length. After having implemented them, I may issue a pull request for this code, if you like. However, I don't want to hurry ahead of your work.
But there are some other bugs and possible improvements for the dual extrusion as e.g. mentioned in the submitted issues #100 and #101 on Github for the CuraEngine.
Furthermore, having the ooze shield drawn twice per layer results in a blob mess for the second material on my UM1. Thus, I'm currently working on removing the second ooze shield pass with a plugin.
@DiscoStu: I once had 16mm retraction length for the extruder swap and it resulted in a clog. I then switched to 13mm which never caused me any problems.
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