Since the new hot end is longer than the old one, we are going to print a new duct for the layer cooling fan. We will need to extract the inserts from the old duct so they can be reused.
If you have extra M3 inserts, you can skip this step.
This step is best done with the shroud in a bench vice.
Take one of the four screws from the layer fan and screw it in to one of the inserts, leaving enough length to grip it with a pair of needle-nose pliers.
Heat up the screw with a soldering iron and apply upward pressure with the pliers until the insert comes out.
Before handling, wait until the screw and insert cool completely or dip them into water to cool them more quickly.
Repeat for the other three inserts.
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