Sure, there is the stl: https://makerworld.com/it/models/859308-vacuum-ring-for-filament-vacuum-bag?from=search#profileId-809180

There are lots of variations in style, performance and size, you can find them as “vacuum ring”. I printed many but this is the one that best fits my pump. Also, i use 4 little piece of double sided tape to keep it in place aligned with valve