Finally satisfactorily optimized the connections inside the #WS2812 #LED cube base of my 8x8 Cube Orb project. It's a *really* tight, tricky fit and challenging build, but the cube interior securely holds a #Pixelblaze, a sensor board, and 4 C-sized NiMh batteries, which last quite a while. The lid slides into place and latches with magnets. I'm writing the project up for @makemagazine, with info on 4x4, 5x5 (easier) and 8x8 versions so all build files will (eventually) get published.