Somebody posted on G+ a video of their carbon fibre printer going quickly and quietly. I just found a Tom Sanladerer video talking about the stepper driver brand - Trinamic - that was used. It gets quite technical but by the end Tom's giving the drivers ( over a year ago) a big thumbs up. Interestingly there's a focus on noise and drivers Tom cites as being their competitor - by Texas Instruments - I think were the ones tested and rejected during the kickstarter campaign. Anyone know anything about this stuff?