I don't own a um2 and I don't know how much would help to have perfect pulleys. My gt2 on my umo+ are quite ok (better than the woobly mxl has by default). For high precision stuff I always go to misumi, but I suppose there's other sources.
The specs of size are on the github https://github.com/Ultimaker/Ultimaker2?files=1 but indeed it doesn't say what gt2 is. But indeed is GT2 20teethEdited by Guest
Everyone has *perfect* pulleys then?
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