MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
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