The other open source alternative is the bcn3d sigma if you want something relatively fast. They've just started production.
And of course you could wait for ultimaker... looking at the age of the um2 it would be logical for them to come up with something new.. but who knows if it will be dual extrusion and how long you would need to wait.....
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Labern 775
I don't think they have resolved the common dual print issues.
as you can see that the dual kit has experimental next to it. I think you will experience all the problems that Ultimaker had and why they didn't release it.
It that's ok by you then why not buy all the Ultimaker parts to turn a UM2 into dual print. then you can stay with ultimaker but have Experimental dual print.
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