, the Bulldog XL can be used as a direct-drive OR a bowden-drive feeder tough, see the below picture:
i do not know of anyone that tried the bulldog xl, tough i like the idea of a geared feeder and i am myself in progress since a few weeks ago of designing a simple geared feeder upgrade for the UM2 that also reuse the most parts possible (will probably test my first prototype in a few days)
The UM2 splits the extruder into 2 separate parts - the feeder on the back of the machine and the nozzle on the print head. This makes the print head very light weight and you can have accelerations of 5000mm^3/sec. So I don't think it would make sense to use these extruders on the UM2 head.
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