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The only improvement would be to make it out of Pyrex glass. Even $60 for a glass one would be a good deal, something to pass onto your children to remember the revolution in coffee making. Glass would be preferred partly because of plastic leaching, and partly because of cracking that has occurred inside the tube due to hot/cold cycles. The cracks have not caused any issues so far, but they may eventually cause suction issues or wear down the rubber as it moves past (in my pictures you can see some wear on the surface of the rubber). This is after 3-4 years and 1000 cups of coffee. Also a comment regarding the plunger. I actually store the plunger inside the tube, pushed all the way through until it pops out the end, just to save some space. This seems to keep it in better shape, pinching the narrow part of the rubber and forcing the wide end to expand, at least in theory. Perhaps this is by design, otherwise I would suggest the designers to consider this when they design the pyrex glass version. As for the pyrex design, I would use pyrex for the tube, strong metal for the plunger rigid part, strong metal for the screw thing, and silicone plunger. All food safe.