Edit: Regarding queries about the cake holders I used. The ones I bought (generic, cheap ones so unfortunately no links) are ±210mm inside diameter against the lid, and 200mm at the base (slopes outward towards the lid). They are about 80mm deep when taking the lid into account.

Remixed from the original design by Maaarsl, thanks for the inspiration! Did some minor remixes to the original design. I couldn't find the same size containers, so found ones similar to fit the smaller eSun spools.

I printed at 0.28mm layer height, no supports. I printed all the parts in one go on my Ender 5 Pro.

Parts needed in addition to printed ones:

1 x PC4 M6 Bowden Connector 1 x length of Bowden Teflon PTFE Tube cut to length you prefer (about 5-6cm to guide filament past any rough edges where it goes inside) 2 x 608ZZ bearings (I added a printed spindle that works well with a bit of sanding down - but can use anything else to mount them) 3 x M5x30 bolts and nuts (2 to connect the centre spindle and the disc outside and 1 to screw the lid to the centre spindle) 3 x 5mm washers 6 x M4x15 bolts and nuts (4 to fix the pedestal to the underside of the box - I had to cut mine a bit shorter and 2 for the Bowden connecter section) 6 x 4mm washers

Drill holes in the correct places, and as per the original design, drill carefully to avoid plastic of the container cracking.

Silica gel packet shipped with the spool from eSun is then left at the bottom of the container, below the spool.

Been using them for a while now with no problems.