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Yes, it is amazing how those kilometers accumulate over time.. but after 5 years it is not that much really, I am printing stuff only occasionally on weekends (I think I used 2 reels (1kg each) of ABS so far).
Here at work we are printing lot more often, on daily basis almost... and funny enough, we never had that problem despite our hot-end throat is simply a stainless steel barrel.. which some sources on the web blame for nozzle clogging and saying PTFE insert is an absolute must... so go figure.
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