Turns Creality 1 kg refills into a complete spool that mounts directly on the Elegoo Centauri Carbon 2's spring-cartridge spool holders. Two parts, screw together, no hardware.

│        Dimension         │                                                Value                                                 │

│ Disc diameter            │ 195 mm                                                                                               │

│ Disc thickness           │ 4.0 mm                                                                                               │

│ Hub outer diameter       │ 74.6 mm (fits 76.2 mm / 3" refill bore)                                                              │

│ Center hole (both sides) │ 56.0 mm / 2.205" — fits CC2 cartridge, AMS-style holders, and standard ~55 mm spindles               │

│ Accepted coil width      │ 52–62 mm (thread clamps flush at any width in range)                                                 │

│ Assembled overall width  │ coil width + 8 mm (60–70 mm)                                                                         │

│ Thread                   │ Trapezoidal, single-start, 5 mm pitch, 1.8 mm depth, Ø66.1/64.6 nominal, 0.30 mm radial clearance    │

│ Side A                   │ Disc + 46 mm hub, internal thread — refill slides fully on                                           │

│ Side B                   │ Disc + 6 mm support collar + 20 mm external-thread sleeve                                            │

│ Extras                   │ 8 lightening windows per disc; 3× 1.8 mm filament-parking slits per disc rim (grip 1.75 mm filament) │

│ Model volume             │ Side A 100.7 cm³, side B 94.5 cm³ (solid)                                                            │
 

Print settings (tested): PETG, 0.4 nozzle, discs down, no supports, 4 walls, 5 top/bottom layers, 6-10% gyroid (or any you like) . Hub and thread walls print as solid perimeters at 4 walls. PLA works too but can't use inside filament dryers over 40F so stick to petg.

Assembly: slide refill onto side A's hub → screw side B in until its disc presses the coil snug → park the filament end in a rim slit. Coil tension preloads the threads, so it self-tightens in use; unscrew to swap refills.