This is an remix of a good top mount spool holder for your anet a8 so it's stronger.
Credit to the original design of mightynozzle for his thing https://www.thingiverse.com/thing:2162266
In the picture his original spool holder is in green, I added length pictured in red to the front clip because it looked like it could slip off with a big spool. I also added more strength to the back (in red).
As the orginal maker said: It is compatible with the "Anet A8 Brackets to Reduce X-Axis Motion" by Leo_N: http://www.thingiverse.com/thing:1872162 (they are installed on my anet a8)
You can print in ABS or PLA etc. I print with speed of 60mm/s 1.6mm walls, top, and bottom. 10mm brim. printed in ABS at hot end temp of 240, bed temp 100, glass bed, and elmers glue stick for adhesion help.