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I am using marlin driver for which not much information or documentation is available. Also machine.xml is different from gcode driver.
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One thing I am afraid you will run into, however, is that trying to place with both heads at the same time will cause your component rotation to go out of whack. It appears that the Marlin firmware only stores an overall machine rotation for the extruders, while the smoothie appears to keep rotation information for each extruder. This means that when OpenPnP tells the left nozzle to turn 90 degrees, the Marlin firmware thinks both nozzles have turned 90 degrees. It was pretty maddening, since a job using only nozzle would work fine, but as soon as we added placements using the second nozzle, things went crazy.
Too bad. I had setup Marlin and everything was working as expected until I ran the first job where the rotations were messed. Its due to the internally shared value for the extruders current position. Did you find a solution/workaround? would really like to use marlin...
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This is because Marlin (and I think most 3D printers) usually use the extruders in relative mode, rather than absolute. The current position doesn't matter in relative mode. T0 and T1 just change which motor will move, and then it is commanded to move plus or minus some distance.
There are other firmwares that might work better on RAMPS. It may be worth checking out Aprinter: https://github.com/ambrop72/aprinter. It's more modern and if it doesn't work it might be much easier to modify.
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would you mind to share your config and firmware? I had marlin optimized
so far like you (remap heater pins to use them with M42 as general IO
and other stuff like MIN_STEPS_PER_SEGMENT 6 changed to 1 to make all
the small moves), but now that only thing of separate positions I am
missing...
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