What’s the best 3D-printed thing you have?

Some items for fun:
My son and I printed totoro figurines as he really enjoyed the "My Neighbor Totoro". It is one of my favorite movies as well. We still need to paint them, however.

Also, there are BRIO compatible train tracks that have gotten a ton of use! They are great for building flexible toy train tracks that you can't find elsewhere.

For me:
I've 3d printed some gears in order to attempt to retrofit my old dobsonian with onstep.

I know I could just buy a computerized telescope, but the idea of breathing new life into an old manual dobsonian seemed more fun.

I also have some wall mounted holders for some handheld vacuums in my kitchen that have come in handy, but the wife thinks they're ugly!

Well, probably the printer itself, alongside several modifications that I have built.

But other than that, I have two very practical things I use all the time. One is a bracket I use to fix a broken bed frame. The other is a collapsible laptop stand that I use to hold my laptop up so I can use it in a dual screen setup. It holds it at exactly the perfect height and angle, something that is surprisingly difficult to get in a stand without spending considerably more money than I wanted to (which is anything at all, naturally). There’s also a handful of ultra-customized storage containers and cases.

I also designed my own personal MiSTer arcade setup that integrates an iPad screen, a power supply, and a handful of other goodies into a single package. It has some design flaws that I have been meaning to fix but haven’t gotten around to it because I don’t have enough space to actually use it.

The most impressive one is an accordion-like MIDI controller that I built 3 years ago, with a lot of 3D-printed parts.

It's too awkward to be an everyday musical instrument though, so it sits in a display case.

I have ideas for a better one and occasionally I work on on it.

Hard to choose a favorite, but my favorite print so far is probably the fully vented version (available under STL/CAD file area) of this Lenovo Thinkcentre Tiny chassis. Printed it in transparent PETG so the LEDs of the PC shine through it. Love it both for aesthetics and functionality. Machine runs a lot cooler now.

I really enjoy one of my first prints which fixed a door catch in my apartment. It's just a simple extender onto the strike plate to help the door latch actually catch and keep the door closed. It helped establish the magic of being able to fix a real world problem in a direct, lasting way.

I also have a few prototypes of a tinker toy esque connector to join cardboard strips into a structural form. It never worked particularly well, but the idea of taking card board boxes, cutting them into strips and then making a giant version of tinker toys is just so appealing to me!

Not very fun or interesting but all my gridfinity storage and soldering workshop stuff. It’s just every day useful.

Probably my 3D printed wireless earbuds.

There is a specific pair of wireless earbuds that I like because they are relatively cheap, low latency (good codec support), and sound good. Unfortunately, the plastic shells of the earbuds are glued together and inevitably that glue fails and the earbuds come apart. I could just re-glue them, except that...

The batteries also eventually fail and need to be replaced. If I re-glue the earbuds back together, getting them apart in the future to replace the batteries would be a nightmare.

So I designed and 3D printed my own shells for the earbuds. The shells are assembled using micro screws instead of glue, making them easy to take apart and access the components inside. I'm proud of how they turned out. The 3D printed shells are generally the same shape as the originals, they sound just as good, still fit in the same charging case, but now they're more repairable.

The only downside is that the 3D printed shells are not waterproof. That's not a big con for me though because I never used them near water anyways. I could probably make them waterproof if I wanted to spend more time on it.

Another nice benefit of designing my own shells for the earbuds is I get more choices for what batteries to put inside them. I was able to fit slightly larger (capacity, not dimensions) batteries so now they last longer between charges and should take longer to degrade.

It was a fun project that exercised a lot of CAD skills that I let atrophy over the years, and the end result is a significantly better item than what I started with.

My keyboard case was 3d printed. It fits my hands so nicely.

Most "used" : a holder designed in 5 minutes to hold the stick that holds a noren (japanese shop curtain) for our bedroom (the cat doesn't like closed door). It's basically a C-shaped thingy, so nothing interesting to look at.

Most useful but we don't need it anymore : ergonomic bag holder that we used for trash bag (those strings kinda hurts when the bag is heavy).

Useful and glad we have it: a box that holds the insert for our kitchen mandoline

Most designed : For a larp, I've modded an ikea candle lantern so that it include an programmable RGB ring led (so whatever object is in place of the candle have a magical glow on it). As such I've designed foot extension for the lantern that house the rest of the electronics (an esp32 and a 3x AA holder) with a magnetic door. In action it looks like this