If you like 3D printing, then put a ring on it. Put an SD ring on it.

Holding a micro SD RAM card, the other day, I noticed it was about the same size as the face of my ring. It was pretty easy then to stick an SD slot onto the top of a ring I quickly designed in the shape of the one I've worn for a long time.  At this point it has had about 30,000 downloads at the other place. Helllooo Printables! 

The 21mm version (medium) fits the middle finger of my manly man hands. I have also created a small (16mm) one and a big beefy(25mm) version. (see later note below regarding other sizes) The small one is just a bit too small for my pinky, so prob would work for some ladies or kids. Big and beefy is suitable for monsters, all-star wrestlers and professional phone-book rippers.

I've used a little 'tension bump' in the card slot to keep a good hold on the SD card. Depending on your printer, slicer and such, you may have different results, but for me the card is held nicely secure, without being hard to extract.

Given the shape, you'll need some supports. My results are pretty good with just supports down to the build plate, and a raft, but see what works for you.

Note that all microSD cards are not equal. A fraction of a mm makes a difference. One of the ones I have is a bit snug in a ring that fits another perfectly. If yours is like that, a bit of sand-paper on the 'tension-bump' of the ring will compensate a bit.

Great printable gift for that geek that has everything, yet still carries his SD card in his pocket. Please share your result pics! Would like to see what it looks like in other colours than the white and grey PLA that I've got.

Caution:  Wear it around outside at your own risk!  If you have a loose fit to your SD card due to printer variability, wear or heavy use, you could lose your SD card and have to search for it. That's much easier around home than out in the wilds, so be careful. 

Extra Bonus

If you don't have a microSD handy, but still want to try the ring. Included is an STL file for an insert the shape of a microSD but with a stylish, hemisphere on it. It will slide into the ring and you can wear it purely as a fashion statement. Or edit the STL file to make it your initial or a heart or some other thing. :)

LATER

The ring has been a popular make since first shared. It's also been invaluable for me as an everyday-use thing. I'm often transporting a microSD as I run around my house.  But showing my ring to others, often it didn't fit their fingers. New sizes were added as noted.  If you RESIZE the STL for your finger, remember you can only resize the ring part - not the data card holder piece, 'cuz that needs to stay the same to fit the microSD.

Take a ring that already fits you nicely, and put it on a ruler, then measure the inner size of that ring in mm. There's probably an STL for you already, so try that.  Let me know in comments if you'd like to see another size that works better for you. Won't necessarily show up quickly, but I'll try to add new sizes as requested.

Notes:

Supports are important both for stability and supporting the layers. Being a circle, it's self supporting to a certain extent, but the card slot 'box' will certainly need supports under it.

Use the best resolution your machine can muster.

Being such a small item, it uses very little filament, and prints fast, so you can play with it a little bit

Have only tried it in PLA - it's remarkably strong.

Post-Printing

Depending on how clean it comes out, you may need a bit of sanding - try a bit of sandpaper rolled up to sand the interior of the ring to ensure it's smooth against your skin.

Some microSD cards seem to be slightly thicker than others. You might need to slightly sand the tension bump to let the card come out more easily. Most of mine seemed to have a good balance between friction to hold it in place, and ease of removal.

Drag a sharp tool (e.g. a mini screwdriver or blade) around under the lip of the slide-in space to ensure there are no tendrils left that will obstruct your card insert.

Size Updates

Added a few more sizes for fingers close to 17.0mm, 17.7mm, 18.6mm or 19.5mm.

The originals are called: small (16.8mm),  medium (21.0), and  beefy (25.6).

Design Date:  Dec 2016

Category: Rings