Anet A8 horizontal spool holder extended size (15mm)

It's remix with expanded gap (15mm) for use with [Anet A8 Brackets to Reduce X-Axis Motion](https://www.thingiverse.com/thing:1872162)

You may have difficulty installing the left Spool_bracket_15mm_left.stl. Use the rasp ;)
Spool_bracket_15mm_universal.stl is easer, but not tested.