"Progress isn't made by early risers. It's made by lazy men trying to find easier ways to do something."― Robert A. Heinlein
I have to admit that your Eager Beaver ways of building these NxNxN cubes appeals to the engineer nerd in me - BUT - I try to remember the RAH quote above and think it through before I start building. If I had Protean Pete to help I might launch into the same project. Unfortunately my wife has other more pressing projects to while away my hours.
I will leave you with this thought. Prove , solve for n>2.
Meanwhile I'll ponder my elegant solution and publish it before I retire. If there had been more room in this post I could have scribbled it down here ;-)
@kevinwongs: Very cool idea. With so many solder points. how to you plan to solder those. With any of these soldering irons it will take a lot of time...
By my calculation and when the cube finally rests on its PCB there will have been 2384 solder joints made. I use a fairly cheap solder station like this one.
I'm building the cube in 8 flat 8x8 panels. The blog for the construction of these panels will be posted in the next few days, here is a link to the video in the meantime. The 8 panels will then be assembled into the cube. It has taken me a couple of months doing a bit as and when time allows to get this far.
You could drive your whole LED cube in 24 bit colour, with a 30Hz refresh rate, using one pin of a FPGA. Each LED buffers the signal, tidies it up and hands it off to the next LED.
All you need is a 5V @ 30A as each LED is 0.3W,
What can I say, if only the Neo-Pixels were available before I started this project. I am where I am and it's to late to change. I already have experience with the Neo-Pixel strips as well so quite used to coding them. Maybe the next cube.
Max has bought enough Neo-Pixels and intends on building an 8x8x8 cube with them. Lets see how he gets on. I was looking to see if I could adapt my PCB design for him to use.