57mm adapter for 52mm Ansen Style Slot Bearing Holder

I really liked cstanley's Ansen Slot spool insert (https://www.thingiverse.com/thing:338669) and wanted to use them on other spools. This adapter will snugly* receive his design and will fit inside a 57mm spool (like that which came with my Anet A8's initial spool of blue PLA). SketchUp file is included so other size adapters can easily be made by others.

*at least as printed on my printer they fit together snugly.

73mm adapter: https://www.thingiverse.com/thing:2800265