I believe that in general the marlin firmware has a pause feature and there are expansion connectors on the UM2. While you might need to do some custom coding in the firmware, it should be doable.
The nice thing about UM is it is open source.
Here is the controller layout and schematic:
https://github.com/Ultimaker/Ultimaker2/blob/master/1091_Main_board_v2.1.1_(x1)/Main%20Board%20V2.1.1.pdf?raw=true
And the firmware source:
https://github.com/Ultimaker/Ultimaker2Marlin
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skint 62
Welcome to the forum. Im not aware of anything like this for the UM2 at the moment, but i kind of remember somebody doing something similar for the UMO. I`m sure as everything is open source here, some brainy people could help you get this going on an ultimaker
Which changes at makerbot are making you think of changing?
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