Elegoo Centauri Carbon 3Kg Spool Holder Support Structure

9/5/25 Update:  All changes are in bold italics.  Includes instructions for simpler way to adjust the height of the file and a warning that the base file might not be the exact right height for your machine.  Unfortunately, I unintentionally measured and designed on a severely bowed table. 

I printed Uncle Jessy's 3kg Spool Holder for the Centauri Carbon, but noticed it severely drooped when putting on a full 3kg roll.  To prevent the cantilever, I designed a support structure that can be attached and removed in seconds from the outer edge of the spool holder.   

It keeps the filament roll level and prevents unnecessary torque to the Centauri Carbon's side panel. 

Compatible with Uncle Jessy's 3kg Spool Holder and pascal_lb's original spool holder design.

Note: Height designed for the stock Centauri Carbon directly on the table.  The vibration feet are not being used and the printer is not sitting on other materials.

• I found 166mm tall to the best height for the stock printer. (Update 9/5/25: I just found out the table that I tested the file on is fairly bowed.  When I got a new Centauri Carbon and tried this file, the structure about 2mm too short when the printer was in the middle of the table, rather than the edges.  Double check and  measure before printing to ensure you get the correct fit). 
• Resizing instructions of the .F3D to get the appropriate height and hexagon look can be found at the very bottom. 

 Files:

1. Design with hexagons and built in supports for the top hexagon. (STL)
2. Design with hexagons, no top hexagon, so no need for built in supports. (STL)
3. Design completely solid, no built in supports. (STL)
4. Master File for resizing/ altering hexagon placement. (F3D)

Print Instructions:

• Print model vertically, needs to be rotated in the slicer. 
• I used Polymaker PLA Pro, but should be fine with regular PLA or other filaments
• I used fairly stock print settings, 0.2mm layer height, 2 walls, 15% gyroid infill. 
• All printed without supports.  You will get floating warnings, ignore them. 
  • File 1 has built in supports for the top hexagon overhang. 
    • Probably not the best built in supports, but they do the job and can be removed after some finagling. Recommend removing from the inside, completely flat side to keep the exterior nicer.
  • Files 2 and 3 have no built in supports. They were not needed for the design. 

Resizing the Master File:

Update 9/5/2025 Much Easier way to make small height adjustments.

1. Select the bottom surface, and extrude the few millimeters you need to adjust the height. 

Older/ more complex way (better for large changes)

1. Open the Master file in Fusion (not sure if it can be open in other CAD programs). 
2. Edit Defining Sketch and select intended height to the center of the spool holder. (the extrusions will likely go crazy, that is ok)
3. Edit Hexagon Placement Sketch. Click on any of the hexagon vertices and slide until you get a position you like within the “rectangular” window.
4. Edit the Extruding Hexagon Cutouts. Clicking on the objects you want to cutout. 
5. Edit or delete the Built In Support Sketch, Extrusion, and Pattern to resize/ adjust/ create your intended built in supports depending on what you need. 
   • Standard hexagons below top row do not need supports.  
   • I have found that the rounded corners of the “rectangular supports” in the 3 wide hexagon (current configurations) do not need supports.
   • Top center in a 3 wide setup or the top two in a two wide set will likely need built in supports made to accommodate the large, rounded, overhangs. 

This is the first model I have made for printables, and the first time using built in supports, so any advice or suggestions would be appreciated.