We don't yet support different size nozzles in the same print but it is in the road-map. We just shipped 1.7.0 with lots of updates to path planing in the slicer and our focus is going to be on editing tools as the next big feature. Once that is in we are looking to do lots more with multi material printing including various nozzle sizes.
Yup, that M107 must be it. It's the only difference between the two codes. Even if I put it at the very end of the start code it changes everything. No bed heating, slow homing...
So, a little clarification, at the risk of making myself look stupid. The info I had about the M190, M104, M109 codes was coming from the RepRap wiki g-code page. My memory told me it was 3D printer g-code in general. I guess there are still inconsistencies between the 3D printer manufacturers. In fact, the M107 fan off command is deprecated in RepRap; maybe that's the problem. I believe the FlashForge control is based on RepRap.
For now I am going to have to translate all my files through Replicatorg to clean out the M107, unless there is another way to get it out of there.
Unless, of course, I am still doing something wrong...
Still, nice piece of software! I've tried a few so far and this is my favorite.
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