4 years later, this filter is still running. It worked well, and still does (and will for a little while).

It is an easy filter to make, but not the simplest to maintain. Not that it's complex to maintain (you just pull it out of the water, get the sponges and rince those before putting it back in the filter), but  it's not quick nor a pleasant experience. Not that i expect it to be super fun to clean a filter, but it's anoying enough to do that i don't do it often enough.

So what would i change?

• make sure to have no sharp or pointy plastic bits to avoid hurting yourself when cleaning the filter
• have the pump separated from the filter media (but why not, surrounded by sponges to absorb vibrations)
• have the filter output pipe not going trough all the filtration media (as of now, it sometimes pops out when you pull the sponges)
• if possible, have separated compartments for each media (at least for bio media);
• if possible, have each compartment accessible without removing everything.

As for this project, it is very unlikely to see some updates, since i'm working on two separated projects that will simply replace this one :

• a 3D printable internal aquarium filter, adressing most of the updates i wanted. This one will be entirely 3D printed (appart from the pump and the media of course), so making one simply consists of printing stuff, assembling the parts, installing the pump and the media, and use it;
• an external filter using a bucket, way more "hacky", but it will provide an enormous filtering media capacity, and i will have to clean it very rarely.

I'll add links for those projects here when i make the projects pages.