This is a remix of the "TTN Ender 3 S1 Spool Helper Spacer" by Thrifty_Tech_Nerd ( https://www.thingiverse.com/thing:5680892 ).
I adjusted the ID and length to fit the Ender 3 S1 Pro.
As with the original, just remove the end cap using an Allen wrench, slide on this spool spacer, and reinstall the end cap. Leaves around 5mm of wiggle room for a standard 1KG spool.
Print with cone facing down, no supports required.
The author remixed this model. Imported from Thingiverse.
Adjusted the ID and length to fit the Ender 3 S1 Pro.