My buddy was having a difficult time sourcing a replacement cover for his Spa filter. He mentioned it to me so I decided to do a quick Fusion 360 design of the cover and this is the result. I hope this helps others who may be having a difficult time finding this “in the wild”.

The actual pictures here were printed on my Ender 3 a few years ago before I understood how to dial in my printer. Your version may print better.

Cheers,

Steve