SummaryI've been much happier with the H3 feeder unit over the original but it still needed some improvements. This is a drop in replacement gear which (i my opinion anyways) is much much more quiet then the both the original and the H3 Gear,. My original source for the herringbone gear was http://www.thingiverse.com/thing:40334 but I needed to increase the size by 15% of both gears so that it would fit into the larger area of the H3 feeder.InstructionsI used 1mm settings with 75%. leaves enough space for the oozing to overflow into.