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.

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If you have downloaded and printed the most current Hero Me Gen2 base, you can slide the base down over the hot-end from above, or fully disassemble the hot-end as wdrake3 has suggested. Here are links to two videos that shows you the assembly process: https://www.youtube.com/watch?v=hHQKr-LgvfI and https://www.youtube.com/watch?v=xPvLKSClShc&t=1s