This is a spool holder support for the AM8 (aluminium frame Anet A8) and can be used with the 8mm screwed rod that comes with the printer.
Compared to most other spool holder (supports), this takes up little space on the printer and is conveniently placed above the x axis direct drive.
I have used it in conjunction with my other design https://www.thingiverse.com/thing:2772607 ,and it works really well. No supports are required.
You can also reuse the M8 nuts that come with the printer too.