Digital Sparkle Collar

2025-Apr-02, Wednesday 01:00 am
History )

Collar )

Circuit )

Attachment )

Putting it all together )

Finishing touches )

Coding )

Testing )


Photo of the neopixel collar, closed, and turned on, with four wires meeting in the middle, leading to the Gemma in a translucent bright green 3d printed circular case, inside yet another in a translucent bright green 3d printed circular case, with the LEDs in various shades of green, yellow, white, and off.

Digital Sparkle Collar, with more robust case situation
Photo by [personal profile] chebe

Gemma projects revisited

2025-Mar-26, Wednesday 12:00 pm
It can be funny, what projects end up being used for a very long time. But with time comes maintenance, and possibly even improvements. Which is what happened as I was considering ways to make my beloved Gemma projects less fragile. When they were constructed I didn't have a 3d-printer, which ruled out experimentation. But I do now.

Gemma case )

Tiara )

But if we're talking about improvements around things involving Gemmas, then I'd like to present a lifetime achievement award to the maker of this JST connector extractor model. It's explicitly for micro:bits, but it's the same JST-PH form factor as used by Gemmas, Floras, and Lilypads. It is the 20 minute print that I wished I've had for the last 15 years. *applause*


Photo of two tiny bright green 3d prints, with two triangular 'hooks' at one end, and a raised area and hole at the other end for gripping.

JST-PH extractor tool
Photo by [personal profile] chebe

Divoom Pixoo Slingbag is nice looking bag, with a 16x16 RGB LED screen in it. I was curious and wanted to look inside. (I must caution you if you buy one for yourself; there are always discounts, don't pay full price. And their after-sales marketing is often overwhelming.)

The bag is constructed well, of decent quality materials. The LED grid works very well. The app for it, on the other hand, is absolute hell. Other people have made alternative clients for them, like the DivoomClient for ESP32, Divoom Timebox Evo, but the only one I personally tried out was the Windows Diwoom client. Which worked pretty well, but made me realise the bluetooth communication isn't protected at all. If there isn't a client currently connected to the bag, there's nothing stopping anyone else from connecting and changing the displayed image. So clearly the hardware had to come out.

Details )


Photo of the outside of the bag, in regular light, with the Rainbow animation playing.

Outside view of the bag, new display in place, running Rainbow example
Photo by [personal profile] chebe



This bag is quite eye-catching, and people have asked me questions about it whenever I've brought it out. I look forward to customising the animations, eventually. There are repos that will decode the actual animations from the app, but there doesn't seem to be a ready library for implementing them in MicroPython (I saw a promising one for CircuitPython, which alas is not MircroPython), but I'll keep investigating. Also, the original display is still functional, so that might find a use somewhere that isn't public.

Lamp light diffuser

2024-Mar-20, Wednesday 12:30 pm
My office/workshop is not meant to be a photography set. The lighting isn't suited to product beauty shots, yet photos still happen in here. Part of this is that I'm more photosensitive than your average maker and will happily work away in my dark cave. But I want better photos, so I decided to try and improve the lighting situation without splashing out hundreds on professional gear (that won't fit in here anyway).

Details )


Two black 3d printed rings set into each other, with two layers of greaseproof paper sandwiched between them, fitted to a silver Ikea Tertial lamp shade

Diffusion ring fitted to lamp
Photo by [personal profile] chebe



Before and After )
Some time ago I got myself an Adafruit LED Glasses Starter Kit. But other than turning it on and running the example code I hadn't done much with it. Then with the return of Congress I, of course, wanted all the LEDs, so I dug it out. First things first, how am I going to wear this?

Physical details )


View, from the wearer's point of view, of my glasses, with the LED front panel attached via overclip nose-bridge, and driver case attached via velcro to the left arm.

Front panel and driver attached to my glasses
Photo by [personal profile] chebe



Code details )
There are a lot of brands of sewing needles, and they come in many different types of packages. This makes storing them neatly a challenge. Unable to keep track of which ones I had, and which ones I needed, I cracked and measured all the different types I have. The card packaging of the Organ needles is the widest (John James is the tallest), so wide that I realised that if I make the width just a little bigger I could fit two of the more standardised plastic packs side by side. It came out to each slot being 72mm x 8mm X 30mm.

Which fits;
Klasse
Prym
Schmetz
John James
Organ
Lapwing

In 3D Builder I made ten of this shape, arranged in a grid with 4mm walls between and around each, and subtracted them from a larger block (maintaining the wall widths). Then I printed the result. I had massive problems with the PLA filament I was trying to use. In the end I scrapped* the entire roll and went back to my reliable black PETG.

(* scrapped in that, I'm going to find a way to use it outside of my printer, probably following these ideas; 'Can 3D Printing WASTE be Recycled at Home?' by the Brothers Make)


Photo of a shiny black plastic printed caddy with 5 rows and 2 columns of slots filled with various packages of sewing machine needles (and one tiny pair of snips), on a table in front of my sewing basket.

Finished sewing needle caddy
Photo by [personal profile] chebe

Burda Smoking Trousers

2023-Aug-22, Tuesday 04:30 pm
The fabric choice in the top was driven by the fabrics I wanted to use in the trousers. The trousers in question being a soft tuxedo-style; BurdaStyle Smoking Trousers (Plus Size), March 2013, numbered 140B, (same pdf as the 'Marlene (as in Dietrich) Trousers'). The provided image doesn't really show anything, so let me describe them. These are a non-stretch straight-leg pattern to be made up in crepe. It closes with an invisble zipper in the centre-back, and there are back waist darts. The (front) pockets are curved, and the waistband has a two-overlapping-at-centre-front-curved-pieces detail, that is actually sewn together, with two buttons as just decoration. The pattern also has optional side stripes, which it suggests to use a sequin fabric with.

Many details )


Front view of a full-length pair of black crepe trousers, with curved diagonal pockets, and a waistband of two overlapping curved pieces, seemingly held together with two black buttons, hanging from a black trouser hanger against a white wardrobe.

Burda Smoking Trousers, finished, front view
Photo by [personal profile] chebe

The best feature of TPU is that it's flexible. Which makes it an ideal material for wearable 3D prints. If I can figure out how to handle it. To that end I gave this Faux Barbed Wire Choker and Bracelet Instructable a go.

Did I mention that TPU is stringy? Well, it is. The lower example in this photo is how they come off the bed. Then the work is trying to pull off most of the strings, snipping chunky pieces, and then melting messy bits. The Instructable mentions burning them off. This is how I learnt that TPU is flammable. The top example is what my attempts to clean up the prints results in. Each shiny, rounded blob is where fire happened.

I persevered, and had a few goes. I am under-whelmed by the results. Partly because of the burning, but also because of the very clearly visible layer lines. The ones in the Instructable came out much better. I've got a ways to go yet. TPU is tricky y'all.


Two 3D printed faux barbed wire bracelets, in black TPU. The top one is cleaned up, with melted blobs at the end on most of the 'barbs'. The bottom one is how they come off the bed, messy and with lots of extra strings.

The cleaned up, and straight off the bed, versions
Photo by [personal profile] chebe

Not too long ago I got my hands on a Purism Librem 5. I'm still trying to get to know this device, so I can't say much about it yet. Except that I love everything it's going for. I just don't know how to make it work for me. Mainly because, with a fully charged battery, and all the hardware switches in the off position, by morning there is hardly any charge left. *sad shrug*

But you know me; if it's a small piece of tech it needs a case! You cannot buy a case for this phone. You must make your own. Thankfully there is a whole case repo with options for you. I went with the slim phone case.

You might have noticed that these cases are meant to be printed in TPU. I've never tried TPU before, so let's give that a go! I ordered the TPU from my printer manufacturer in the hopes that it would work with less effort. I, um. Well, it's a case, that's for sure. But. This is stringy. When the print comes off the bed I had to pull/scrape away as much excess material as I could. I had to snip some blobs off. I tried to melt some problems away. But mostly that resulted in nearly creating holes. There are places where the layers didn't bond, and I had to cut some of them off. The inside corners of the case gathered a lot of extra material, and makes the case fit even tighter. But it does fit. So, mostly a success I guess. (If I try another print I'd pick a chonky case.) TPU is tricky y'all.


Librem5, screen off, in a black TPU case, front view from above. The corners of the case look rough, and there's gaping at the sides.

Librem5, in a black TPU case, front
Photo by [personal profile] chebe



More photos )

Cases for EMFCamp badges

2023-Feb-08, Wednesday 02:45 pm
What? I like cases, okay. I have three emfcamp badges; 2014, 2016, and 2022. I got the case for the 2016 badge at the camp itself, from the incredibly patient Fab Lab Truck people. But there is a similar one on thingiverse, for those with access to laser cutters.

I got the 3D printed case for the 2014 badge from this Lush Project's project. Be warned, it is a slow, but very solid print.

I got the 3D printed case for the 2022 badge from the official github, and unlike the other badges this one really needs a case. The default wear option sees the lanyard string wrapped around the header pins between the two boards, and more than once I found then forming a very worrying y-shape, instead of sandwiched flat together. This is a fiddly print, and the orientation I chose had a lot of supports because one piece of the case jutted out more than everything else. But it's a funky shape, so just have to roll with the complications for groovy shape.

And thus, a well protected collection.


Left; 2014 badge, red board shaped like a tilda symbol, in black 3D printed case. Center; 2022 badge, USB flash drive shaped, blue board with sea themed silk, in black 3D printed case. Right; 2016 badge, pale laser cut wooden case covering most of the badge, with four purple zip-ties.

Badges with cases; left: 2014, centre: 2022, right: 2016
Photo by [personal profile] chebe

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