This is to hold a 2nd spool of filament on top of the Anycubic Kobra.
It's very sturdy, and has to be.Holds at least 1kg (2.2 Lbs) and could hold more.
It takes about 3 hrs to print and uses 115 grams of filament, about 38 meters.

This Mounts on top of the existing Spool Holder Foot mount, and requires 2 M4 screws that are 10mm long.
Installation:
Take off any spool you have on the original holder
Unscrew both M4 screws in the original holder foot and set screws aside
Put 2 M4 x 10mm screws into the newly printed Filament holder foot.
Place the New foot on top of the old foot and line up screw holes.
Hold the 2 pcs together with left hand and place the whole assembly onto the top of the Kobra gantry with screws lined up with threaded holes.
Hold down with left hand and turn screws in with right hand until snug.

I printed mine with these settings:

Layer Hight: 0.3mm
Nozzle size: 0.4mm
Material: Ziro Black PLA
Hot end Temp: 213c for all layers
Bed Temp: 65 for all layers
Supports: Yes, just for the end of the Spool Tube rim
Infill: 15% Rectilinear
Walls: 3 top, 3 bottom, 3 vertical
mounting Hole size: 4mm+
mounting Hole distance: 30mm apart
Spool Holder Tube: small Diameter= 32mm
Large end diameter = 45mm
Spool Holder Tube length inside to inside of chamfer edge = 66mm
Total Tube length outside to outside = 75mm
45 degree arm length = 230mm
Distance from Spool Center to Spool center = 270mm
Programs: Fusion 360, Prusa Slicer
Machine: Anycubic Kobra