You can also print a low friction spool holder. Both Robert and I have one on youmagine that mounts like the original one. Or there are heaps of other styles to choose from.
I like to replace the rear fan with sunon MC25060V2-A99 just to make it nice and quiet. There are ducts to help with cooling for that fan 2 like this one.
There isn't much evidence on most mods to prove one is better than another or even helps at all so some comes down to what you believe is best.
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Labern 775
The Olsson block normally require less heat at it has a longer heat zone. But the fans do cool the tip as you state. You can try this extension and see if your temp settings come back to normal. If not you may have a bad pt-100 temp sensor.
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