I'm designing a cradle to hold a GoPro camera to the bottom of an AR Drone. It's obviously not complete, but I wanted to make sure I had designed the clearances for the male and female sections that join the two halves correctly. This doing 3d modeling. Right now I have a .5mm clearance on each side, but that leaves the parts with a 1mm wall which is close to the minium. Should I make the walls thicker? I would like the parts to fit together as snugly as possible, can I reduce the clearance any? My plan is to use strong and flexible plastic, polished. My overall goal it to make it light. Strength is not as much of a factor, but I don't want it to fall apart under it's own weight. It just doesn't have to survive a 50' drop.