3D Printed Neopixel and Trinket Necklace

I got an UP! Mini 3D printer for Christmas this year.  Wowza.  I'm SO excited.. I haven't stopped playing with it since just about the minute I unwrapped it and I'm having tons of fun.

I printed a mermaid seashell, then I printed Elsa's crown from Frozen which I found on Thingverse.  I'm such a girl.

I've been making necklaces lately (this LED Turtle necklace that I made as a Christmas gift is my favorite so far).  It's a challenge to fit all the electronics and the battery and microcontroller into a small enough package that sits comfortably around my neck, but I'm slowly getting the hang of it.

I decided I wanted to design and print a pendant that is just the right size for a neopixel ring and Trinket microcontroller, with enough space for a small rechargeable LiPo battery and a nice flat back that closes up and looks pretty.  The ABS plastic filament my printer uses diffuses light really nicely so I decided to try using multiple thicknesses to add interest and texture.

This is harder than you'd think.. I've never done 3D design before and it makes me think in ways I haven't had use since high school geometry.   But it's also much easier than you'd think because there are some awesome free tools out there that had me up and running in minutes.

I have been using Tinkercad and I like it so far.. I've got a lot to learn but after 5-10 different attempts I ended up with a pretty delightful 3-D Printable necklace enclosure.


It's got a hole for the USB port for charging.  It has another hole for the wires to come out at the top.  It has a front side which is rounded to hide the electronics and a back side which is flat and smooth against my neck when I wear it.  (next step will be to learn how to make them snap neatly together, but hey, give me a minute, it's only my first day).  It also has a pretty cutout pattern of lines and circles to diffuse the light in an interesting way.

I printed it out, then painted it gently with gold leaf paint to give it some sparkle and more definition.  The paint is opaque so it really brings out the design.

For the electronics, I'm using a Trinket 3v and a LiPo charger, both of which I removed the battery connectors from and soldered directly to the pads instead.  (Those little connectors are SO BIG when you stack them up!  The components stack quite neatly without them)

I'm using a 12 Neopixel Ring and a single LED from a Neopixel strip in the middle.  The code is my new favorite "Holiday Twinkle Lights" sketch using FastLED.  I made this one gold and white fairy lights since it looks so nice with the gold leaf paint.

I'm also using a magnetic clasp as an on/off switch, which seems to be my new favorite switch method for necklaces.  It's super elegant and clean.

I'm pretty proud of this!  My first 3D Printed Design Thing and it feels so professional and slick.  :) :)

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Secret of Nimh Sparkly LED Necklace

So, I have been making stuff.  I never stop making stuff.  I just haven't been posting about it all.  :)  Too busy traveling the world as a Mermaid, I think.

But this one is so much fun I want to share!

This necklace reminds me of the sparkly in the Secret of Nimh cartoon.  I mean, I've always wanted a Sparkly for my very own...  hasn't everyone?

I started with a neopixel.  I did a resin cast, embedding the neopixel inside.  Then I glued a small neopixel ring on the back of the hardened resin jewel and wired it up to the embedded pixel.  I love the neopixel rings, but  trouble is that they leave a dark spot in the middle, so adding a single neopixel in the center makes the whole thing glow more evenly.

I wired it all up to a beetle board.  These are super cute and teeny tiny, though they are a bit fiddly and sometimes I want to smash them with a shoe.

I tested lots of different LED code effects before I found this one on the FastLED forum and tweaked it so it gave me the look I wanted.. clouds, sparkles, fades, and the whole thing slowly cycles through the rainbow, giving me every color over the course of several minutes.   It runs on a small LiPo battery glued to the back of the beetle board.

I looked through my "steampunk junk" drawer and found the little pocket watch blank -- I probably got it at Michael's or a halloween store at some point.  I took off the back and the flip cover and used a dremel to rout out the inside metal tabs, and the whole necklace assembly fit perfectly right inside.  (I was tempted to leave the flip cover on, because a flip cover pocket watch necklace would be super cool too, but I decided it's better in it's constantly open state and who wants to walk around with a covered up LED necklace anyway?)

The new thing, the bit I'm proudest of, is the magnetic clasp / switch.  This has always been an issue for me with making LED necklaces.  Well, two issues -- one, where do you put the switch so it's not visible or rubbing against your neck, and two, how do you have an open-able clasp if the wires are going around your neck?  With this solution I fixed both problems in a most elegant way.

The magnetic clasp is a super simple solution, and much less expensive than buying an on/off switch.  I'm considering adding a non-wired magnetic clasp in there too, in case I want to wear this necklace when it's turned off... but.. why on earth would I want to do that?

Before you ask.. yes, I have considered making these for sale.  But, my MO for any type of thing I make seems to be this:

1. Make a whole bunch JUST FOR ME until I have way more than I can use
2. Make them for my friends as gifts / giveaways until my friends get sick of them too
3. Make them for sale, if I'm still excited about the process and if I can guarantee they won't break.

That's the issue with LED clothing, costumes, jewelry, etc... it breaks!  It breaks all the time.  I'm convinced that this is why it's taking so long for cool LED glow fur and costume bits to make it out to the retail stores.. I have to fix on my LED costume bits so often, and the fixes are usually pretty tricky and involve soldering irons and replacement wires and parts, that I just couldn't justify selling this stuff until I feel super confident it won't just fall apart.

Here's a picture of the guts.  I might add some kind of cover back there eventually but then there'll be issues with plugging it into the charger, so I've just left it techie-looking for now.  :)  And it's nice and smooth on my neck, and doesn't seem to want to spin around, so maybe I'll just leave it.

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Heart shaped pendant

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Beautiful Bird Necklace in Silver color

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