Sunlu spool adapter, lightweight

Adapter ring for the large, 73 mm diameter Sunlu filament spools to be used on the Creality Ender series 36 mm diameter filament holder arm.

Final revision, added a simplified model as version 2 where you can remove the initial and top layers and a 15-20% infill of a good vertical infill pattern like grid, hex or triangles will produce a light but solid structure. Make sure walls or perimeter are at least 2 but 3 is better.

Prints lightweight, fast, uses less material.