Filament sponge for Prusa i3 Hephestos

There is always a bit of dust on your filament spool and I had problems with thunderbugs which invaded into my monitor and my filament spool.
I wanted to prevent them from entering my extruder and influence the print result or block the heater.
So I decided to print a small case for a sponge. It doesn't need any support and prints at a layer height of 0.3mm within 20 minutes.

On Prusa i3 Hephestos it stands fine on the extruder. Might fit on many other printers as there is no special moun