Hanna tester boxes

New updated version! (see below)

I have a messy container that I keep all my aquarium tests in. The Hanna boxes take up a ton of space, and don't seal the reagents (Hanna says they go bad after the package is opened). They also don't leave the cuvettes or lids in a good air drying place.

To get rid of the plastic bags I've been keeping it in, I spent way more time designing and printing these Hanna tester containers than I'd like to admit. The reagents are kept in a little container, all the cuvettes and lids are held upside down in ventilated areas, and screwed in so they don't bounce around. They are small, the base is reusable across testers, and the top piece can be swapped for different types. You can see through the front to grab the right test (I might make that little lid have the test type name in it).
 

There are many others of these, but I wanted to build this one to ensure things were stored upside down (to drain), highly ventilated, things locked into place, and individual tests separated versus a big multi-device holder.

This was designed to not require supports, and the profiles I provided do not include them.

Updated V1.1 version (March 2026)

I’m surprised I’ve been using these for two and a half years at this point, and I really appreciate all the prints, likes, and boosts! These things take forever to fine tune, and though I like doing it for my own purposes, it also helps to see others enjoying them. Please continue with the feedback!

For me, the most annoying pieces of this I have now improved in V1.1:

1. packet lids now lock in place — I have a new, snap-fit, lid that locks in place and will not fall off. This fixes my main annoyance that I could never get the lid setup just right to always stay in place
2. cover locked in place — similar to the packet lid, the covers overall I added more snap-fit to. This ensures the overall lid also stays in place. This came loose much less frequently than the packet lid, but depending on the filament used it could happen more. It shouldn’t happen now
3. strengthened — I’ve inadvertently broken the threads by being clumsy, and also one time I dropped / stepped on one and it got majorly destroyed. To help avoid that, I’ve strengthened all the connection pieces by adding more rounded edges (filets). This is something no one hopefully notices, but improves the overall model

Also some tips:

• silk fabric can look cool, but works very poorly on a model like this — that filament is just too brittle and it breaks at all the important parts after repeated use
• the new lids fit tightly — the first time I put them in it can be very hard to get them out. Make sure to get any support material popped off, including the brim. If needed scrape with a fingernail a bit. Then push it in and pop it out a handful of times. For me, after a couple rounds of that it snaps in tightly and comes out with a reasonable pull

Given V1.1 is brand new, please send me replies or direct messages if you run into any issues. I’ll keep fine tuning. I’ll leave the previous version up as well.