Hands down, the brain enclosure has been the most difficult part to manufacture. That’s partly because it’s PETG (flame resistant) and partly because it’s so large that as it cools the edges tend to curl upward. The value of 3D printing (and CNC technology in general) is that it makes more materials accessible to individuals (or small groups) - which then fosters innovation. If we started MARSfarm 10 years ago, we wouldn’t be able to make anything out of plastic until we were producing that part by the 1000’s.
After dozens of failures (beyond what you see here) we finally upgraded three of our printers to the newer Ender Pro 3’s - highly recommended - which I got for ~$200/ea. Here’s a link to buy it from Microcenter.
