My JBJ 30 rimless has been up and running for a few months now. Instead of spending money on a filter pad holder and water diverter, so I decided to model one up and print it myself. I bought some felt at the fabric store and cut a bunch of 4" squares that I just remove and toss every other day or as needed. Both parts printed in black PETG. Both these parts are base on InTank designs.
Thingiverse link

Thingiverse link