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PLA nozzle temp increasing

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I've been using my ultiimaker 2 for about 9 months.

I've noticed the functionalnozzle temperature for PLA has been increasing in the last 2-3 months. While I used 210 F initially, I've been forced to increase the nozzle temp to up to 240 F with the same spool to make it work. If I don't increase the nozzle temp, the material won't flow.

Anyone knows why is this happening?


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