The file 'Ender 3 Spool Spacer Ring 101% 3D Printer Model' is (stl) file type, size is 15.7KB.
Ender 3 and its clones spool spacer ring.This allows you to avoid swinging the spool while printing.
IMPORTANT: it is highly recommended to scale the thing 101% to put the spool on the standard axle without problems !!!