I've had this puzzle (the 2 color) version just about six months now. It arrived with some stickers not quite sticking, as the surfaces underneath appeared to be 3d printed and not sanded. I glued all the trouble stickers down and haven't had any further issues with them. I've yet to successfully solve this puzzle, as during solves the white caps can fall out. This typically will happen when they are on the bottom face of the puzzle. As they have orientation, if they are not put back in correctly I end up with an unsolvable puzzle. I've debated gluing the caps on but as they are over the screws, I've not yet done so. It's a cool concept but it needs proper finishing, especially given the price.