Just a very quick design.
The aim of this spool Holder is to clean up a bit the top table and reuse its space.
Print 2 and use the original m8 rod from the anet a8 spool holder.
Attach it with 2 wood screws (4mm inside hole, 10mm for the head)

Edited with CATIA V5, original file is attached

Anet

A8

No

0.2

10%