IIRC the heated bed can draw more current than the POWERSUPPLY of the ultimaker can handle. So getting a separate powersupply would be a good idea. Assuming the board has the STP55NF06 as listed on the 1.5.4 board layout, it should be possible to hook up loads up to 7A, or at 19V about 133W. On the other hand, you'll exceed that a bit with 1.3 ohms.
By connecting the external powersupply ground to the ground of the ultimaker, andthen hooking up the heater element between the external powersuppply positive side and the mosfet output of the ultimaker board, you'll be able to control it from the ultimaker. Some electronics experience required I'd say.
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chemwhite 0
I wouldn't use acrylic for the heated only because the thermal conductivity of the acrylic is low, which might make control of the temperature on the top side of the bed a little difficult.
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