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I spend long periods away from home and my Lego bricks due to my work, so I end up doing a lot of design in computer with the likes of LDD, LDraw/bricksmith, and mecabricks. The problem is that none of these have any "physics" in them, I can't ever see how strong or stable the model is. So I end up spending hours agonising over the way the bricks are stacked, worrying over whether or not they will lock together solidly enough in real life. I also spend ages checking brick link and Lego bricks and pieces to make sure the pieces I use are available in the colours I choose, but that's another story. When I finally do treat myself and buy the bricks for one of my creations, they invariably fall apart. A couple of years back it was a 50 piece micro-scale particle detector that took 2 hours to get together and exploded at the slightest touch (and I do mean that literally, bits went flying all over the room!). My latest fiasco is a model of the Mercury-Redstone rocket, which I designed to go with the Lego Ideas Saturn V. It's just a stack of 2x2 round bricks with three axles inside due to it's height, yet despite my best efforts to put the axle transitions well inside bricks, the rocket easily falls apart into three neat chunks (one for each axle). So, what's the secret? When you design in computer do you care at all about how the model would behave in real life? And if you do care, do you have any tips on making sure that the model holds up well when physically built?