This puzzle was initially created by Oliver Polspeul by bandaging a 4x4x4 cube to become a big 2x2x2 and
attaching the top and bottom layers of three Square-1s to the centers. He named it "3square_in_one". A second time it was built by Claus Wenicker in 2009. This is - as far as I know - already a 3D printed puzzle.
The current Square-1 Cross Cube is definitely 3D printed and smaller than Oliver's version.
The inner 2x2x2 cube has the typical 5.7cm edge length, the Square-1 add-ons have a size of 4.1x4.1x1.9cm.
Ryan Binter took into account that the Square-1 pieces would scratch over the 2x2x2 stickers, so he deepened the surface of the 2x2x2 to save the stickers.
Both Oliver's and Ryan's puzzles turn very well. I did not have the chance to test Claus's build.
Weight: 137g (Ryan Binter)
External LinksOliver Polspeul: 3square_in_onehttp://http://spols.ovh.org/cube/album.php?album=0303square_in_oneSquare-1 cross cube (now with video)http://http://www.twistypuzzles.com/forum/viewtopic.php?f=15&t=21863&hilit=Cross+Square+1