Make a resin cube out of an LED light bulb and a few other bits and pieces.

Each time I have make one of these I always think – this could be better.  The first 2 versions which can be found here and here, worked out ok but I have discovered that batteries don’t like to be enclosed and that their fail rate goes up dramatically when they are.  This is due to the fact the batteries need to breath and once encased in resin suffer a slow death.  I can still charge up the original ones but the batteries only last for a couple hours.

So I was thinking the best way to fix this would be to remove the batteries altogether.  I did toy with super caps but a quick search on the net show they wouldn't be suitable for the job.  Caps release their energy quickly and this just won’t work on something like this.

I finally decided to go down the path of using a wireless charging module.  These are really easy to use and work like a charm.  I used one in version 2 to charge the batteries up. 

The other really cool thing about this version is the LED light.  It comes with a remote and has heaps of features which allows you to change the colour and display of the LED's.

The project itself is quite simple and the only real messing about is making the box that the cube sits on.  But you could easily simplify this and just use a brought box of your choice.

Video below.

You can also click "here" to watch the video
and here's how you make one...
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wdsparrow6 months ago

You mentioned that you don't encapsulate the batteries because they have no room to vent. I have a suggestion for you. Use LiFePO4 batteries (Lithium IRON or LIFE batteries for sort). As I understand it they only vent under the most extreme conditions which you project would never hit (good ones can charge and discharge in 5 minutes, under those kind of conditions they would vent). Also you could put the batteries inside a sealed box held in place with foam. In this way even if they vented a little they would be venting into a area that had some space to vent to. In this way you could keep the batteries inside the cube. I have been learning alot by watching your process and can't wait to attempt a wireless charging version with multicolor remote controled bulb using LIFE batteries.

lonesoulsurfer (author)  wdsparrow6 months ago

Man - great idea! just been reading about LIFE batteries and they look like they would solve the venting issue.

Let me know how you get on with using the batteries.

hollejd11 year ago

Awesome project!

I am building this as a project for class but I had to substitute the bulb and resin with the US equivalent. I will post pictures of it when I am finished.

Just an edit, the 600mA restriction on the charging coil is for the output not the input. The resistor is unnecessary. I have tested this out and it worked fine without the resistor.

lonesoulsurfer (author)  hollejd11 year ago

Cheers mate - looking forward to seeing what you came up with! Let me know how you found the instructable when using it.

The reason why I used the resister was i was finding that pumping 12V and 2A into the charging coil was making it heat-up. Actually I decided to purchase a lower amperage adapter and this seemed to do the trick. Do you know the amperage of your one?

hollejd1 made it! lonesoulsurfer1 year ago

Finally finished it. My base is not as clean as yours is and I didn't put a finish on it yet. Thanks for this awesome project.

lonesoulsurfer (author)  hollejd11 year ago

Great job man! You really got a nice finish on your cube. Thanks for posting some photos.

That makes sense. I have a 9V 800mA adapter. I didn't notice any extreme heat but I never ran it for more than a minute. I also used the 9V coil because I wasn't sure which one to get. It works fine but the 9V battery is not strong enough to produce the white light setting on the bulb. I have almost everything I need at this point so all I need is to build it. Should be awesome when its done.

jarodpenn1 year ago
This is AWESOME. I'm planning on doing this version as my own personal Jedi Holocron! Got a question though: The link you posted for the LED globe navigates to a different bulb than whats pictured. You reference a b22 but is that the screw in type you have pictured?

ahh much improved mold. Better than the OJ or milk carton.

how much was the bulb?

I've been following all the versions you've done and keep thinking how I'll do it. I think I decided to put rainbowduino in the box underneath and have a solid resin cube on the top. I have no idea if it will glow as well but am going for a translucent not clear cube. (which is also easier to make based from what I got from your earlier versions)

If I actually end up making an instructable ill sure link to yours for the inspiration.

Eye Poker1 year ago
A.I.M. and the Red Skull would like to have a word with you ab out the Cosmic Cube you have stolen.....
sbanas1 year ago
About how much was the total cost?
lonesoulsurfer (author)  sbanas1 year ago
It was probably around $40 to make. The resin is the most expensive part of it.
I will bet that too resin is expensive
nerd74731 year ago
Epic dude
Jimmeh301 year ago
yes, that's what it means. Eg. if you look at the bottom of your electric toothbrush (assuming you use one ;) ) you'll notice there are no contacts for charging it in the dock. The power to recharge 'em is "transmitted" just like FM radio.
Jimmeh301 year ago
"Caps release their energy quickly and this just won’t work on something like this." To a direct short or very low resistance load, sure, but like all power supplies (batteries, transformers etc.) they will NOT release all their energy any faster than it is drawn by the device they're powering. I don't see why supercaps couldn't work in this.
Now that I think of it,
It might be good to test for the best method of gluing the film to the mold wall. it's possible that glue dots on the edges will do just as well. (The weight of the resin is probably sufficient to keep the film flat even when the resin gets hot).
thanks! one thing I forgot to mention about using transparency film as a mold-liner: Before applying to the mold walls, look at the film...theres a shiny side and a frosted side. The shiny side will make contact with the resin. Also, make sure the entire surface of the film is glued (with spray glue) to each wall of the mold or the catalytic heat (might?) cause it to ripple.
kcchen_001 year ago
Nice project!

Would the cheap weather resistant 12v LED strips work instead of sacrificing the light bulb?
lonesoulsurfer (author)  kcchen_001 year ago
The globes are only $9.50 on eBay so it's not too much of a sacrifice. You could though use LED strip if you wanted to though.
jtechian1 year ago
Have you ever tried to cast this with a small amount of glitter mixed it? Mat have a nice effect. :)
lonesoulsurfer (author)  jtechian1 year ago
I haven't but there is another ible' where someone did. They used glitter stars which looked great. Not too sure if it would have a huge effect or not as the light from LED's isn't diffused.
Might have in above!
Samuel kos1 year ago
Love your light cubes.Have yet to make one but I want to so bad!
lonesoulsurfer (author)  Samuel kos1 year ago
If you are going to do one i'd definitely do the 3rd version as this has so far worked the best.
Well i do hope to make one but how much resin did you use in this version?
lonesoulsurfer (author)  Samuel kos1 year ago
I used about 500 g which is the size the resin comes in. The cube would have been higher if I didn't lose so much resin in the core flute (mold)
nmsr11961 year ago
I used this same resin to try and encapsulate a regular led, but the resin melted the led.
Does this happen to this led light bulb?
lonesoulsurfer (author)  nmsr11961 year ago
Haven't had that issue yet, but the resin can get really hot if you mix too much catalyst with the resin
Very cool indeed. I appreciate your attention to detail, not just in the craftsmanship but in your communication style. These are "instructables", after all. I'm not sure everyone gets it. Voted for you everywhere.
Always good to get some positive feedback,
jproffer1 year ago
just curious but the point of a heatsink is to dissipate heat, in this case from the LEDs. With the heatsink fins encased in epoxy, passive cooling cannot occur since there is no airflow over the fins. Won't the LED overheat if used for long periods of time, and eventually get damaged?
lonesoulsurfer (author)  jproffer1 year ago
The LED's themselves don't get hot, it's the actual spot on the circuit board to where they are joined which can start to heat-up. As I'm only using 9 volts the heat is minimal. The heat sink will adsorb some of the excess heat and the resin actually dissipates heat pretty welll.
cool project:)
Here's a tip for getting a perfect surface with no sanding:
Use polyester film (the plastic sheets used for photocopy transparencies) as a mold liner. No mold release is necessary as the film will not stick to the epoxy resin. (I think this is also true for polyester resin--but test first.
lonesoulsurfer (author)  hotmelterguy1 year ago
Great tip thanks. I have managed sometimes to get a crystal clear and smooth finish sometimes, others it's been a bit of a shambles and I have had to sand and polish till my arm ached!
jimmysymo1 year ago
I posted a comment on the last stage (9) Like this a whole lottttttttttttt.
jimmysymo1 year ago
Like your Ideas,and your work. Looks really good .Don;t know all the electrics that you talk about . When you said wireless do you mean you can recharge the battries with-out haveing any physical contact with them. ie like a wireless mouse for the computer???
johncorado1 year ago
It looks so cool but it's so hard to understand do you think you can make a video?
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