Mike, I am going to ask the obvious difficult question. I have always been a fan of your skimmer design since first seeing them at the Bob Moore. I am happy with my OBD skimmer, it performs well, and I am very happy to see you have taken some of my feedback into account in your new design with the twist resistant base to make for easier cup removal. So here goes....
The entire skimmer industry is constantly evolving and has always been a compromise between the science of fractionation, the cost of fabrication, and the available materials, (ie the new DC controllable pumps that many skimmers are going to). When there is a design feature that becomes standard in the industry, the hobbyist believes that that design feature is necessary. ie everyone is doing it so it must be the right thing to do. Now that being said, there are not many skimmers out there using air stones anymore, yet you have provided a sound and reasonable argument as to why your design with the new non clogging air stones is superior, and I am a fan of that. However... and here comes my question finally.... the inclusion of the cone design, or at the very least a cone neck to focus, concentrate, and direct the skimmate as it rises seems to be the preferred method yielding best results. Your new skimmer design does away with the cone neck in favor of a straight tube with no focusing transition. It would appear to this under-educated hobbyist that this is being done simply to achieve an easier and more cost effective build process as I know it is difficult and time consuming to fabricate those cone necks. It would seem you lose a little in skimming efficiency in this trade-off. If this is the case, I understand, you have many challenges in re-birthing OBD and getting product on the shelves in a timely manner is important. However, I wanted to afford you the opportunity to explain the change, and if there is sound reasoning behind the switch that does not detract from performance, if there is a reason other than cost and time savings in the build process, I would enjoy learning about it.
Thanks for your time and contributions to the furtherment of the hobby,
Ichthys.
PS I considered posting this in the OBD skimmer thread, but this thread is where your new skimmer design showed up first.