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...think something called a streaming instability is the key. This sounds complicated, but it's not dissimilar to a traffic jam, or a bunching up of all the dust in a planet-forming region into one place. Amazingly, the research carried out on parabolic flights by OU academics and researchers backs up this idea. The icy particles collide, then slow down and start rotating....

...systems, unmelted material is not lost and can generally be reused. Furthermore, because the layer height is defined by the amount the build chamber is lowered, the layers can be very small, resulting in very fine feature resolution...[Images to demonstrate 'Selective laser melting (SLM)' -see article ] Manufacture: The main heat sources are as follows: Lasers are the...