Hypercube Evolution shorter duct

I had some trouble when printed parts started curling up and the tip of the original duct started hitting the curls, so I edited the original duct to be 2 or 3 mm shorter and higher, so that I can print without the risk of ripping thin support columns straight off. There are two versions, one to be printed upright without support or bridging, which works better with PETG, and another one that should work fine with ABS.