Bambu Lab Spool Locking Shim - STEP Version

I was having a heck of a time printing BBL's [spool shim STL](https://wiki.bambulab.com/knowledge-sharing/print-volume-limitations/bambulab_spool_spacing_shim.stl) (can't properly tag it as a remix) in PETG Basic, so I re-created the model in Fusion, made a few minor tweaks to the geometry of the finger tab and such, and exported it as a nurb instead of a mesh. Imported with high resolution it prints MUCH better than the original STL did for me in both PETG and ASA.

Tuned print profile available over on [MakerWorld](https://makerworld.com/en/collections/2072567).