I bought my Ultimaker last November. Didn't get it working until January. Once it was working, I was having nozzle plugs constantly, too. I increased the print temperature to 225c for most of my PLA prints. That made the flow much smoother, but the high temperature creeps up past the aluminum heat sink and causes plugs up in the Peek and nylon area. So, I mounted a fan which only blows through the space between the aluminum heat sink and the bottom wood plate. That gave me about 6 weeks of constant printing with zero plugs until my Ultimaker stopped working completely a couple days ago. Sadly, it died 23 hours into a 25 hour print.
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Daid 306
Recommended printing temperature is 210C. PLA starts to flow a tiny bit at 180C, but you need a higher temperature to really print at the speeds that the machine can achieve.
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