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It's for ritualistic sacrifice of the remains of your nearly spent spool!

Actually it's to deal with the small cylinder at the tip of the insert part. Without a second part of the print to move to, the nozzle can twist it out of shape because it doesn't give the part any time to cool, even with a fan on it.

Here's an example: https://i.imgur.com/MbmHUmhh.jpg

You'll see the bottom piece that was printed all by itself has a twisted misshapen end to it, while the top part was printed alongside other stuff.

In the case of the mk10, that part extends above all the others, so I added the tower to address that issue