Updated now to be larger to reduce waterfall noise from the bottom of the cup. I also have seperated the ring and the cup to two seperate pieces to reduce filament use (significant amount of wastage on previous design) by using a split batten/french cleat type attachment, where you can slide them onto each other. I personally added a touch of glue to ensure they stick, but the design does not need it to function. The side slots have been made smaller as well, so you wont need to use as much filter floss to cover them.

You can still use the silencing lid from V1 (below) however I found it quieter without ironically. 

It is based on the previous F3D file which can be found here, and edited to suit your requirements.
https://makerworld.com/en/models/146141#profileId-159106