Cura 3.0

Yes, Robo has released their source and it is 99% generic Marlin ()Marlin 1.0.x for the R1/R1+ and Marlin 1.1.x for the R2/C2)
It is linked from their main website, they keep changing where exactly, but if you poke around you can see it. Looks like they are now using github (which is a plus) so they will hopefully always all be there.


https://github.com/Robo3D/

R2/C2 versions under Marlin and R1 versions under R1PlusMarlin

 

The community has also contributed newer versions of Marlin for all the Robo printers. the current release is 1.1.9. To be specific, the R1 series is still based on 1.0.0 and the R2/C2 use Marlin 1.1.6. In both cases the Community implementation of Marlin is better and removes some quirky code Robo tried to implement.

 

Robo
Marlin supports dual extruder and I have a thread in the C2 section where I modified the C2 to be dual extrusion.
The parts on the extruder carriage are identical for the C2/R2 so much of that would be the same (I suspect yours is already wired internally for a second extruder, my C2 was not which meant a little more effort)

 

The feature is stuck because unless a printer is designed around it multiple extruders is difficult to model for and the software has to be smarter than MatterControl (my personal opinion) to get it to print correctly. In a single extruder printer you load one STL for the print. In multiple extruder you (normally) load multiple STLs one for each extruder [Some printers do it differently and some options like the Pallete have their own slicers] I suspect Robo figured that few people would actually use multiple extrusion and so they eventually shelved it (or put it on a far back burner)

@Geof can explain this better as he even has a Sigma (one of the few machines out there that does multiple extrusion correctly in my book)

 

can't speak fir Slic3r or Cura, but Simplify3D does and I am sure the others do too.

To the best of my knowledge there is zero documentation on the custom control board Robo uses. It is not super hard to decipher, but they don't document it.

Probably won't put your eye out messing with it

Nobody (yet) has taken the time to desconstruct the R2 and document it. I did document the second extruder on the C2, but I didn't delve into the board much to see what everything maps to -- project for someone

(my dual extruder thread here: http://community.robo3d.com/index.php?threads/dual-extrusion-mod-for-c2.17686/)

 

Robo never published the pinouts on their proprietary Ramps/Arduino combination board for the R2/C2. I think the mainboards are identical for both models. I used to have the logic diagrams for the R2 mainboard but those are gone with the latest refresh of my main PC.

If you really need dual extrusion, please look at @mark tomlinson's thread on his C2 conversion. It can be done but is not trivial. And I would also start with the community version of Marlin and add the appropriate configuration items to it as 1.1.9 of Marlin is much cleaner than 1.1.6 that Robo appears stuck on.

 

Sorry I no longer have them and I think I got them from Robo support. But as far as I know they were never released to the public. Robo tries to be very secretive about what goes in their machines even though most of it uses Open Source components (software and hardware) I have asked for the RoboOS source on several occasions just to be ignored, perhaps hoping I would stop asking. The only reason we know where the current source code exists, is because we have examined the code and update locations that are stored on the RaspberryPi image.

 

If you complete this project please document what you did and start a thread here so others may benefit also.