This is design by Scratch 3D Printing, I made a video showing this: 

This is top mount for filament holder for Creality Ender 3 V3.

Printed using PLA (Can be whatever)

Infill about 20%, the more the better.

0.2mm Layer height, and yeah just use your settings 😂 any settings worked.

What you'll need:

• 1x 3D Printed Top Mount Bracket
• 2x M4 Mounting Screw (Comes with your Ender 3 v3 for the side mount)
• 2x M3x12 For mounting the bracket to the printer. Suggestion: https://amzn.to/48Kfv6l