According to the BOM the encoder is:
EC11E15244B2 729-5609 ALPS EC11E15244B2 20mm Vertical encoder 15 Pulses 30 DET
The second number is the RS partnumber.
If you just need the actual knob it is available as a STEP file so that you can print it:
https://github.com/Ultimaker/UltimakerOriginal/tree/master/1129_Knob
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tommyph1208 55
why not just print one? There are multiple examples of redesigns out there... Like this one that sort of makes me think of valve and halflife
http://www.thingiverse.com/thing:33286
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