For slightly tapered baskets.  

2.01 in (51.05mm) OD and tapers up to 2.025 (51.43mm) OD

It was designed for this bottomless portafilter:

https://www.amazon.com/gp/product/B08N56L6PP/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Print with PETG to be food safe. 

.Step and Fusion360 file included it you need to modify.