I suppose I could open the .sch with Eagle which shouldn't be overly hard to get.
For reference the MOSFET is listed as an STP55NF05L so should be able to do what I want to do with it.
ED- scratch that! there's a diode (D3) which is connected to VCC/2 which would cause my 48V supply to feed 48V into the whole Ultimaker circuitry if I did this! This definitely can't be done without addressing this issue at least.
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owen 19
Does this help? http://reprap.org/wiki/Ultimaker%27s_v1.5.3_PCB
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