After wasting too much time trying to find a sponge holder wide enough for a Vileda "Glitzi" sponge I just 3d printed it. Granted, I was too lazy to round off or bevel the edges. Fastened to the tile with double sided sticky tape.

Never mind the stripey print, I was a bit impatient and used a rather high speed. Also the no-name PETG filament has a varying diameter.