I had some rolls from thefoxsmart, that were too small to fit the filament support that came with my printer so I modeled my own. Several of my friends have this printer and theirs came with a different filament support so this might not be necessary for everyone.

Creality

Ender 3

Doesn't Matter

Yes

.15

40%

I printed mine laying down to maximize strength.

I used Solid Works to design this. I am an Electrical Engineer and never took a class on solid works, I just kind of picked it up.