Aquaclear 30 Surface Skimmer

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Remixed from "Surface skimmer for Aquaclear 20 HOB filter" Resized the cylinder to accurately slip fit onto my AC30 intake tube. Fixed the floor of the box to print the right number of layers at Cura's default 0.2 mm profile. At this time it still needs to be tuned for flow. It is definitely skimming the surface already! Two issues - 1) The water height of my aquarium must be lowered substantially to get this to work. I plan on printing a spacer for my AC30 to raise it up. 2) There are vortices forming off a few of the intake holes that are periodically connecting to the intake, causing the pump to suck a bit of air. I plan on tuning the depth of the box, along with the intake holes to get the flow right. Update - 10/1/20: I have optimized the design in several ways and also uploaded a spacer for the filter as promised. This spacer is for a 5 mm thick rimless tank. It raises the filter up 15 mm. The tolerance on the slip fit of the intake tube is critical. It is either a bit too tight or a big too loose. Erring on the side of too loose right now. Will test everything for a while and report back. Update - 10/5/20: After much research, many design iterations (https://imgur.com/lPgl3IT), and finally some math, I have decided to delete the teeth and go to a toothless design. The AC30 flows 150 GPH according to the documentation. The design was getting too large to flow enough with teeth in place. Thus, with the advice from the reef aquarium forums, I have gone with a toothless…