Elegoo Centauri Carbon Roller Bearing Filament Spool Spindle

The original model was listed as “no hardware” but I felt it could be improved by adding some inexpensive roller bearings.  So, that's the only hardware added.

I made following modifications to the original model:
- expanded clearance to accept 6802 roller bearings at both sides of the spool mount (link below)
- changed the direction to “lock” on the base of the spindle - now its clockwise to lock
   (the stock spool holder was CCW to lock)
- extended the length of the spindle for the shift outward caused by adding the inner bearing
- added a “twist-lock” retainer cap to the spindle (the original was "push on")

I like that this spool holder gets rid of the friction from the spool simply laying on the original spool holder arm of the Elegoo Centauri Carbon.  It also accomodates and securely holds filament spools with a variety of center-hole diameters.

I printed mine in PETG-CF for the additional stiffness that it provides.  I suggest that stronger filaments such as ABS or ASA can be used and I would recommend against using PLA as this spindle will need to hold the weight of a full spool of filament (greater than 1kg). 

The "top" of the spindle contains small support blocks in the cap twist-lock path.  They should come out with a twist from some pliers.  I do recommend printing the spindle in an upright postion with tree supports for the base.

I also printed multiple spool holders and can "quick-swap" spools.

I used the following bearings that I found on Amazon:
https://www.amazon.com/dp/B0D1P1BM4S?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1

I did need to shim the fit of the bearings in the recess by putting a couple of pieces of masking tape on the inside of each bearing well.  This helps keep the bearings from falling out.

I also shimmed the bottom of the spindle with a couple of layers of masking tape to give it a more snug fit.