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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I don't have an anet a8, but with a simple google request i found : https://www.gearbest.com/3d-printer-parts/pp_540281.html.
In my case, without heated bed, i use an external 12v 5A power supply.
There is a link in the descrition to show you witch power plug to use.